Question

50 ml of 10N H2SO4, 25 ml of 12N HCl and 40 ml of 5N HNO3 were mixed together and the volume of the mixture was made 1000 ml by adding water.the normality of the resulting solution will be

Answer 1

The formula used is       N1V1+N2V2+N3V3
                                        --------------------------   = Normality
                                  Total volume(including water) 
Total volume =1000mL=1 L

Putting the Values 

  10x $\frac{50}{1000}$ +12x $\frac{25}{1000}$+5x$\frac{40}{1000}$
-------------------------------------------------------------
                               1L

on solving Normality is 1N