91. Solving a chemistry problem

91. Solving a chemistry problem

3. What weight of MgSO4•7H2O should be taken to prepare a standard solution with a volume of 250 ml so that no more than 25 ml of a 0.05 N solution of Trilon B is consumed for titration of 20 ml of it?

Additional information:

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