How many milliliters of 40% w/v NaOH solution are required to prepare 1.5L of 2N NaOH?

Answer 1

Chemists don't use N (normality) anymore, but in this problem, 2N is equivalent to 2 M because NaOH has one equivalent per mole. To prepare 2 N/2 M NaOH, we need 2 moles/liter of solution. For 1.5 liters, we need

2 moles/L x 1.5 liters = 3 moles NaOH

3 moles NaOH x 40 g/mole = 120 g NaOH required

40% w/v = 40 g NaOH/100 ml

40 g/100 ml (x ml) = 120 g and x = 300 mls of 40% w/v NaOH is required