Question

a volume of 42.5ml 0.125M KOH is needed to neutalize completely 37.2ml of H3PO4 solution. Find the molar concentation of H3PO4?

Answer 1

normalitybase*volumebase=normality acid*volume acid
normality acid=.125*42.5/37.2

molarity acid= 1/3 normality acid and you have it.