Acid-base titration device
By designing an automatic titration device and setting a background plate on the back of the reaction bottle, combining the detection host and detection electrode, the problems of low titration efficiency and difficult color changes of existing acid and alkali titration devices are solved, and an efficient and accurate titration process is achieved.
Patent Information
- Application Number
- CN202420817846.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-04-19
AI Technical Summary
During the titration process, existing acid-base titration devices have problems such as low titration efficiency and difficult to observe the color changes of indicators, resulting in inaccurate experimental errors and results.
An acid-base titration device including a bracket assembly, agitating assembly and titration assembly was designed, and the titration bottle and flowmeter were connected through a pipeline to achieve automatic titration; a background plate was installed on the back of the reaction bottle to facilitate observation of the color change of the solution; combined with The host and detection electrode are detected, and the end point of titration is determined by the pH change.
It improves titration efficiency and accuracy, reduces experimental errors, and ensures accurate control of titration endpoints.
Smart Images
Figure CN222506238U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of experimental equipment, and in particular relates to an acid-base titration device. Background Art
[0002] In a titration experiment, the color change of the indicator is used to determine whether the titration endpoint has been reached. Common indicators include methyl orange, phenolphthalein, etc. Different indicators change color in different pH ranges. For example, methyl orange changes from red to yellow, and the pH value changes from 3.1 to 4.4; phenolphthalein changes from colorless to red, and the pH value changes from 8.2 to 10.0. Since the indicator used has a certain color change range, it is difficult to observe slight color changes with the naked eye, and there will be certain differences in the judgment of different operators, which will inevitably increase the error of the experiment and affect the accuracy of the results.
[0003] CN216900462U discloses a semi-automatic acid-base neutralization test device, comprising a base, a bracket fixedly connected to the top of the base, a butterfly clip installed on the bracket, a burette clamped and connected by the butterfly clip, a regulating valve arranged at the bottom of the burette, a cup cover arranged below the burette, the cup cover fixedly connected to the bracket through a cup cover fixing clip, two through holes arranged on the cup cover, rubber rings arranged in the through holes, the bottom end of the burette sleeved in one of the rubber rings, a pH meter glass electrode sleeved in the other rubber ring, the pH meter glass electrode electrically connected to the pH meter body through a connecting line, an automatic lifting platform arranged below the cup cover, a magnetic stirrer arranged on the automatic lifting platform, a spoutless beaker arranged on the top of the magnetic stirrer, a rotor arranged inside the spoutless beaker, and the spoutless beaker located below the cup cover; the utility model can make the titration test more accurate and safer.
[0004] However, the test device of the patent document uses a burette for titration, which requires manual control during use, and has the problems of low titration efficiency and difficulty in observing the color change of the indicator during titration. Utility Model Content
[0005] The utility model provides an acid-base titration device to solve the above technical problems. In order to solve the above technical problems, the utility model adopts the following technical solutions: an acid-base titration device, including a bracket assembly, a stirring assembly, and a titration assembly, wherein the bracket assembly includes a bracket and a support plate, and the two ends of the support plate are connected to the inner side of the bracket; the stirring assembly is arranged on the bracket, including a stirrer and a stirrer; the titration assembly is arranged above the bracket, including a titration bottle, a flowmeter, a reaction bottle, and a dropper; the titration bottle is connected to the liquid inlet end of the flowmeter through a pipeline, and the liquid outlet end of the flowmeter is provided with a dropper, and the dropper is arranged above the opening of the reaction bottle; the titration bottle is arranged on the support plate, and the flowmeter is arranged below the support plate; the reaction bottle is arranged on the stirrer, and the stirrer is placed in the reaction bottle.
[0006] Furthermore, the support assembly also includes a background plate, which is arranged at the bottom of the support plate and on the back side of the reaction bottle.
[0007] Furthermore, the bracket assembly also includes an elastic member, which is arranged between the background plate and the support plate and connected to both.
[0008] Furthermore, the background plate is provided with folds so that the background plate can be folded upwards and stored when not in use; the bottom end of the background plate can be movably fixed on the side of the agitator.
[0009] Furthermore, the device also includes: a detection component, including a detection host and a detection electrode, the detection host is arranged on the support plate, and the detection electrode is connected to the detection host through a cable.
[0010] Furthermore, a clamping structure is provided on the side of the support plate to fix the cable so that the detection electrode can extend into the reaction bottle.
[0011] Furthermore, the support assembly also includes a waste liquid tank, which is arranged on the support and outside the stirrer.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] 1. The present application connects the titration bottle to the flow meter through a pipeline. When in use, the flow meter can measure the volume of the solution in the titration bottle, and has the characteristics of automatic titration, high efficiency and speed.
[0014] 2. The existing titration determines the endpoint of the titration by the color change of the indicator. However, at the beginning of the color change, the color change is not obvious. When the laboratory environment is light-colored, the color change of the indicator may be difficult to observe. Therefore, by setting a background plate on the back side of the reaction bottle, the operator can observe the color change of the solution in the reaction bottle in time to ensure the control of the titration process. The folds set on the background plate can be folded and put away when not in use to avoid affecting the operation.
[0015] 3. Combined with the use of the detection host and the detection electrode, the titration end point can be judged by the change of the pH value of the solution in the reaction bottle during the titration process, thereby improving the accurate control of the titration end point.
[0016] During titration, the device of the present application can determine the titration endpoint by the color change of the indicator and the value change of the pH meter as needed. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 It is a structural schematic diagram of the utility model (background plate is extended).
[0019] Figure 2 for Figure 1 A local enlarged schematic diagram of point A.
[0020] Figure 3 It is a structural schematic diagram of the utility model (background board is folded).
[0021] Figure 4 for Figure 3 A partial enlarged schematic diagram of point B.
[0022] Figure markings: 1-bracket assembly, 11-bracket, 12-support plate, 13-background plate, 14-elastic member, 15-clamping structure, 16-waste liquid tank, 2-stirring assembly, 21-stirring meter, 22-stirring bar, 3-titration assembly, 31-titration bottle, 32-flow meter, 33-reaction bottle, 34-dropper, 4-detection assembly, 41-detection host, 42-detection electrode. DETAILED DESCRIPTION
[0023] In order to facilitate a better understanding of the present invention, the following examples are used to illustrate the present invention in conjunction with the accompanying drawings. These examples belong to the protection scope of the present invention, but do not limit the protection scope of the present invention.
[0024] Example 1
[0025] An acid-base titration apparatus, such as Figure 1-Figure 4 As shown, it includes a bracket assembly 1, a stirring assembly 2, and a titration assembly 3. The bracket assembly 1 includes a bracket 11 and a support plate 12, and both ends of the support plate 12 are connected to the inner side of the bracket 11; the stirring assembly 2 is arranged on the bracket 11, and includes a stirrer 21 and a stirrer 22; the titration assembly 3 is arranged above the bracket 11, and includes a titration bottle 31, a flow meter 32, a reaction bottle 33, and a dropper 34; the titration bottle 31 is connected to the liquid inlet end of the flow meter 32 through a pipeline, and the liquid outlet end of the flow meter 32 is provided with a dropper 34, and the dropper 34 is arranged above the opening of the reaction bottle 33; the titration bottle 31 is arranged on the support plate 12, and the flow meter 32 is arranged below the support plate 12; the reaction bottle 33 is arranged on the stirrer 21, and the stirrer 22 is placed in the reaction bottle 43.
[0026] The stirring component can be a magnetic stirrer, and the flow meter can be a peristaltic pump.
[0027] The pipeline passes through the supporting plate, and the two ends are respectively connected to the pipeline of the flow meter and the solution outlet of the titration bottle, and a valve can be arranged on the pipeline.
[0028] Instructions for use: Place the solution to be titrated in the titration bottle, then connect the titration bottle to the flowmeter through a pipeline, place the solution to be tested in the reaction bottle, extend the detection electrode into the reaction bottle and make the end of the detection electrode below the liquid surface, and place the stirrer in the reaction bottle; start the stirrer, and the stirrer rotates in the reaction bottle due to the magnetic force, so that the solution in the reaction bottle is stirred; start the flowmeter, and allow the titration solution to enter the reaction bottle through the pipeline; observe the change of pH in the reaction bottle through the detection electrode, when the pH value is close to the titration end point, reduce the titration speed, and when the pH value changes to the pH value of the titration end point, turn off the flowmeter and record the volume of solution flowing through the flowmeter.
[0029] Example 2
[0030] like Figure 2 , Figure 4 As shown, the support assembly 1 further includes a background plate 13 , which is disposed at the bottom of the support plate 12 and at the back side of the reaction bottle 33 .
[0031] like Figure 2 , Figure 4 As shown, the bracket assembly 1 further includes an elastic member 14 , which is disposed between the background plate 13 and the support plate 12 and connected to both.
[0032] like Figure 2 , Figure 4 As shown, the background plate 13 is provided with folds so that the background plate 13 can be folded upward when not in use; the bottom end of the background plate 13 can be movably fixed on the side of the stirrer 21.
[0033] The titration endpoint is usually determined by the change in color during the titration process. However, the color change of the solution near the endpoint is not very obvious, and due to differences in personnel observation, it is easy to make inaccurate judgments of the titration endpoint and cause errors. Therefore, a background plate is set on the back side of the reaction bottle to create an environment that is convenient for observing the color change in the reaction bottle.
[0034] The background plate is provided with a solid color, and the dark color is easier to observe. For example, it is set to black, which can be selected according to the color change of the indicator; the folds set on the background plate can be convenient for folding and putting it away when not in use to avoid affecting the experimental operation. The elastic member can be made of elastic materials such as elastic rubber, such as elastic rubber bands; two elastic members can be provided, which are arranged on both sides of the background plate, and the two ends are connected to the support plate and the background plate respectively; because the elastic member will be deformed by external force, the background plate has folds, and the elastic member will stretch when the background plate is pulled down, and the background plate will unfold to a suitable position; after the external force disappears, the elastic member restores the deformation, and the background plate is folded up and put away. The bottom of the background plate is movably connected to the side of the stirrer, and the movable connection structure can be selected according to needs, such as setting a hook at the bottom of the background plate, and a hanging ring is provided on the side of the stirrer corresponding to the hook. When the background plate needs to be used, pull the hook to make the background plate unfold downward to a suitable position, and then hook the hook on the hanging ring.
[0035] Example 3
[0036] like Figure 1-Figure 4 As shown, the device further includes: a detection component 4, including a detection host 41 and a detection electrode 42, the detection host 41 is arranged on the support plate 12, and the detection electrode 42 is connected to the detection host 41 through a cable.
[0037] like Figure 1-Figure 4 As shown, a clamping structure 15 is provided on the side of the support plate 12 to fix the cable so that the detection electrode 42 can extend into the reaction bottle 33.
[0038] like Figure 1-Figure 4 As shown, the support assembly 1 further includes a waste liquid tank 16 , which is disposed on the support 11 and outside the stirrer 21 .
[0039] The clamping structure can be used to clamp the cable of the detection electrode so that it can be hung in the reaction bottle when in use.
[0040] Since the detection electrode needs to be inserted into the reaction bottle during the detection process, after the sample detection is completed, the detection electrode needs to be rinsed with pure water before the next sample can be detected; in order to facilitate rinsing, a waste liquid tank is set on the bracket to collect waste water when rinsing the detection electrode; the waste water collected in the waste liquid tank is poured out and processed regularly as needed. The detection component can use a pH meter. During the titration operation, the detection electrode is placed in the reaction bottle, and the solution in the bottle covers the lower end of the detection electrode; during the titration process, since the stirrer in the reaction bottle will rotate when the stirrer is running, thereby stirring the solution in the reaction bottle. As the titration proceeds, the pH in the reaction bottle is constantly changing. When the titration end point is reached, the titration is stopped, and the volume of the titration solution used in the titration bottle is recorded. The concentration value of the sample can be obtained by calculation.
[0041] The device may also be provided with a controller, which is electrically connected to the flow meter, the detection host, the stirrer, etc., respectively, in a conventional manner, so as to control the above-mentioned electrical components during the titration process.
[0042] The agitator, flow meter, detection host, controller, etc. involved in the utility model are not the innovations created by the present invention, and the specific models are not described here.
[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the statement "including an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".
[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An acid-base titration device, comprising a support assembly (1), a stirring assembly (2), and a titration assembly (3), characterized in that: The support assembly (1) comprises a support (11) and a support plate (12), wherein both ends of the support plate (12) are connected to the inner side of the support (11); The stirring assembly (2) is arranged on the support (11), and comprises a stirrer (21) and a stirrer (22); The titration assembly (3) is arranged above the support (11), and comprises a titration bottle (31), a flow meter (32), a reaction bottle (33), and a dropper (34); the titration bottle (31) is connected to the liquid inlet end of the flow meter (32) via a pipeline, the liquid outlet end of the flow meter (32) is provided with a dropper (34), and the dropper (34) is arranged above the opening of the reaction bottle (33); The titration bottle (31) is arranged on the support plate (12), and the flow meter (32) is arranged below the support plate (12); The reaction bottle (33) is arranged on the stirrer (21), and the stirrer (22) is placed in the reaction bottle (33).
2. An acid-base titration device according to claim 1, characterized in that: The support assembly (1) further comprises a background plate (13), wherein the background plate (13) is arranged at the bottom of the support plate (12) and is located at the back side of the reaction bottle (33).
3. An acid-base titration device according to claim 2, characterized in that: The support assembly (1) further comprises an elastic member (14), wherein the elastic member (14) is arranged between the background plate (13) and the support plate (12) and is connected to both.
4. An acid-base titration device according to claim 3, characterized in that: The background plate (13) is provided with folds so that the background plate (13) can be folded upwards and stored when not in use; the bottom end of the background plate (13) can be movably fixed on the side of the stirrer (21).
5. An acid-base titration device according to any one of claims 1 to 4, characterized in that: Also includes: The detection component (4) comprises a detection host (41) and a detection electrode (42); the detection host (41) is arranged on the support plate (12); and the detection electrode (42) is connected to the detection host (41) via a cable.
6. An acid-base titration device according to claim 5, characterized in that: A clamping structure (15) is provided on the side of the support plate (12) to fix the cable so that the detection electrode (42) can extend into the reaction bottle (33).
7. An acid-base titration device according to claim 6, characterized in that: The support assembly (1) further comprises a waste liquid tank (16), wherein the waste liquid tank (16) is arranged on the support (11) and is located outside the stirrer (21).