The analyzed solution of methylamine CH3NH2 with a volume of 20.00 ml was diluted in a volumetric flask to 100.0 ml, then 10.00 ml of the resulting solution was titrated potentiometrically with 0.1000 M HCl. Construct titration curves in the coordinates pH-V and ΔpH / ΔV-V and determine the concentration (mol / l) of the initial solution of methylamine according to the following data:
Option 10
V(HCl), ml 12.00 15.00 17.00 17.50 17.80 18.00 18.20 18.50 19.00
pH 10.36 9.96 9.46 9.17 8.28 5.99 3.28 2.89 2.56

If the file does not open for you, install the Rar archiver program. Inside the archive, the solution is in WORD format.