How much water should be added to 2% W/V, 5 liter NaOH solution so as to make its concentration to 0.5 N ?

Options

A. 5 lit
B. 2.5 lit
C. 1 lit
D. No need to add water

Answer

D

Explanation

2% W/W
i.e., 100 mL `to` 2 gram NaOH
1000 mL `to` 20 gram NaOH
To get 0.5 N solution,
W = Normality `xx` eq. weight `xx` volume
`= 0.5xx40xx1=20` gram
`therefore` There is no need to add water.