Question

How much water should be added to $200cc$ of semi normal solution of $NaOH$ to make it exactly deci normal?

• A. $600cc$
• B. $400cc$
• C. $800cc$
• D. $1000cc$

Answer 1

The correct option is C $800cc$

Normality $\left(N_1\right)=0.5N$

Volume$\left(V_1\right)=200cc$

Normality $\left(N_2\right)=0.1N$

Volume $\left(V_2\right)=?$

$N_1{V}_1=N_2{V}_2$

$0.5\times 200=0.1\times V_2$

$V_2=\frac{0.5\times 200}{0.1}=1000cc$

Volume of water added $=(1000-200)=800cc$