Question

Percentage purity of commercial sulphuric acid is 98% (w/w) and its specific gravity is 1.8 . Its normality is:

• A. $98$
• B. $79.4$
• C. $36$
• D. $18$

Answer 1

Answer: (C)

$36$

98 gm $H_{2}S{O}_4$ in 100 gm solution

1.8 gm of the solution in $1ml$ of solution.

100 gm solution $=$ $\frac{1}{1.8}\times 100ml$

Volume of solution $=55.55ml$

Molarity $=\frac{98}{98}\times \frac{1000}{55.55}$

$=18M$

Normality $=Molarity\times 2=18\times 2$

$=36N$