42. For titration of 20 ml of sulfuric acid solution, 42.1 ml of 1 M sodium hydroxide solution was used. Calculate the mass fraction of sulfuric acid in the analyzed solution. The density of the acid was not determined; therefore, as a first approximation, take it equal to unity.

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.