Method for measuring free acid concentration in acid liquid
A free acid and concentration technology, applied in the direction of material electrochemical variables, can solve problems such as ambiguity and errors, interference with end point judgment, cumbersome manual titration operations, etc., and achieve the effect of increasing accuracy
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Embodiment 1
[0026] The concentration of free acid in the electroplating solution calculated by pre-calibration contains about 12mol / L of hydrochloric acid.
[0027] Prepare 0.1mol / L NaOH standard solution, use potassium hydrogen phthalate standard reagent to calibrate, the concentration that obtains this NaOH standard titration solution is C (NaOH) = 0.1042 mol / L.
[0028] Weigh about 3.72g of EDTA-Na into a 500mL beaker, add about 300mL of water, heat at low temperature, cool to room temperature after all dissolve, and dilute to 1000mL to obtain an EDTA solution with a concentration of 0.01mol / L.
[0029] Dispense 10.00mL of electroplating solution into a 100mL volumetric flask and dilute with water to the mark. Then take 10.00mL of the diluted electroplating solution in a 100mL volumetric flask, and dilute with water to the mark again. Take two 10.00mL portions of the re-diluted solution and put them into 100mL beakers respectively. Separately, add 5 mL of EDTA solution with a concen...
Embodiment 2
[0031] The concentration of free sulfuric acid in the copper electrolyte calculated by pre-calibration is about 2mol / L.
[0032] Prepare 0.1mol / L NaOH standard solution, use potassium hydrogen phthalate standard reagent to calibrate, the concentration that obtains this NaOH standard titration solution is C (NaOH) = 0.1242 mol / L.
[0033] Weigh about 18.61g of EDTA-Na into a 100mL beaker, add about 40mL of water, heat at low temperature, cool to room temperature after all dissolve, and dilute to 100mL to obtain an EDTA solution with a concentration of 0.5mol / L.
[0034] Dispense 5.00mL of electroplating solution into a 100mL volumetric flask and dilute with water to the mark. Take two 10.00mL portions of the diluted solution and put them into 100mL beakers respectively. Separately, add 15 mL of 0.5 mol / L EDTA solution and 30 mL of distilled water into two 100 mL beakers, put in a stirring magnet, and immerse the electrodes in the solution. Use 0.1242mol / L NaOH standard titra...
Embodiment 3
[0036] The concentration of free acid in the car plate pickling solution calculated by pre-calibration is about 0.1mol / L.
[0037] Prepare 0.1mol / L NaOH standard solution, use potassium hydrogen phthalate standard reagent to calibrate, the concentration that obtains this NaOH standard titration solution is C (NaOH) =0.1149 mol / L.
[0038] Weigh about 3.72g of EDTA-Na into a 500mL beaker, add about 300mL of water, heat at low temperature, cool to room temperature after all dissolved, and dilute to 1000mL to obtain an EDTA solution with a concentration of about 0.01mol / L.
[0039] Take two parts of 2.00mL electroplating solution and place them in 100mL beakers respectively. Add 1mL0.01mol / LEDTA solution and 60mL distilled water to the two 100mL beakers respectively, put in a stirring magnet, and immerse the electrodes in the solution. Use 0.1149mol / L NaOH standard titration solution to perform potentiometric titration automatically. It can be seen from the titration chart that ...
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