Analytical method for mercuric chloride
An analysis method, the technology of mercuric chloride, applied in the field of chemical analysis, can solve the problems of difficult judgment of the end point, time-consuming, complicated operation, etc., and achieve the effect of fast analysis, accurate results and simple operation
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Embodiment 1
[0054] 1. Preparation and calibration of KI standard solution:
[0055] Weigh 3.5762g of potassium iodide, dissolve it with a small amount of water, dilute to 1L with water, and store it in a brown reagent bottle for later use.
[0056] Use a pipette to pipette 5mL of calibrated 0.05025mol / LAgNO 3 Standard solution, placed in a 100mL beaker, then add 10mL1+1HNO 3 solution, 1mL of 2% potassium dichromate solution, put a stirring bar, place it on an electromagnetic stirrer, insert a platinum electrode and a pH glass electrode, under constant stirring, carry out automatic potentiometric titration with KI standard solution, the equivalence point The volume of KI standard solution consumed is 11.852mL, the titration curve is shown in figure 1 . Calculate the potassium iodide standard solution concentration according to the above formula 1, C(KI)=0.02120mol / L.
[0057] Second, the analysis of mercury chloride:
[0058] Weigh 0.5138g (accurate to 0.0002g) of the sample dried at ...
Embodiment 2
[0060] 1. Preparation and calibration of KI standard solution:
[0061] Same as embodiment one.
[0062] Second, the analysis of mercury chloride:
[0063] Weigh 0.1027g (accurate to 0.0002g) of the sample dried at 100-105°C, put it in a 200mL beaker, add 100mL of water to dissolve it, put a stirring bar, put it on an electromagnetic stirrer, insert a platinum electrode and a PH glass To the electrode, add 5% ascorbic acid solution dropwise to make the electrode potential indication between -100~0mv, then add 2% potassium dichromate solution dropwise to make the electrode potential indication at -350mv, add 10mL1+1HNO in excess of 1mL 3 Solution, under constant stirring, carry out automatic potentiometric titration with KI standard solution, the volume of KI standard solution consumed by the equivalence point is 14.641mL, the titration curve is shown in image 3 :
[0064] Calculate HgCL according to Equation 2 2 Mass percent concentration W(HgCL 2 ) = 41.01%
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