Calibration experiments for standard solutions of acids and bases

Summary

This experimental method was obtained from the official website of the Fourth Military Medical University

Operation method

Calibration experiments for standard solutions of acids and bases

Principle

NaCO3 + 2HCI = H2O + CO2 + NaCIHCI + NaOH = NaCI + H2O

Materials and Instruments

Dried baseline sodium carbonate HCl Methyl orange
Analytical balance 50mL acid buret 50mL base buret 250mL conical flask 200mL volumetric flask small beaker 50mL measuring cylinder 25mL pipette

Move

1, the preparation of the reference material sodium carbonate solution in the analytical balance with the differential subtraction method accurately weighing 0.9 ~ 1.2g of the benchmark sodium carbonate in a clean beaker, add 20 ~ 30mL distilled water to dissolve, and then carefully transferred to a 200mL volumetric flask, with a small amount of distilled water drenched beaker for 3 ~ 4 times, all the washings are transferred to a volumetric flask, and then add distilled water to the scale, mixing, calculating the exact concentration, labeling. Prepare for use.

2. with sodium carbonate standard solution calibration of 0.1 mol / L HCl solution of the exact concentration of the acid buret to be calibrated with 0.1 mol / L HCl 2 ~ 3 times, and then loaded with the solution to the liquid level in the 0.00mL scale. Another 25mL pipette with the above preparation of the reference material sodium carbonate solution washed 2 ~ 3 times, and then sucked the solution 25.00mL into a clean conical flask, with a small amount of distilled water will be washed down on the bottle wall of sodium carbonate solution, add methyl orange indicator 1 ~ 2 drops, with 0.1mol / L HCl titration to the solution by the yellow color to orange, record the burette readings. Repeat the same method 2 to 3 times and calculate the exact concentration of HCl. And in conjunction with experiment (i), deduce the exact concentration of 0.1 mol/L NaOH.

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