Question

2L of 0.5N NaOH solution is mixed with 1L of 1M KOH solution. The molarity of hydroxide ions in the resulting solution will be?

Answer 1

For NaOH normality = molarity as gram equivalent weight = weight as no of OH- ions in dissociation of NaOH is 1. normality= equivalent moles/volume. NaOH solution thus has .5moles in one litre. thus 1mole in 2L solution. KOH soultion has 1 mole in 1 litre thus when mixed total volume is 3L(2+1) and total moles of OH is 1+1=2moles. thus molarity of hydroxide i resulting solution is 2/3 = 0.66M