Question

The specific gravity of commercial sulphuric acid is 1.8 and it is 98% pure. The volume of this acid required for preparing 7.2 litres of decinormal sulphuric acid is:

• A. $10ml$
• B. $18ml$
• C. $72ml$
• D. $4ml$

Answer 1

The correct option is B $18ml$

$N_2=\frac{1}{10}$

$M_2=\frac{N}{2}=\frac{1}{20}$

$V_2=7.2$ liter 98% pure 98 gm $H_{2}S{O}_4$ in 100g solution

$M_1=\frac{98}{98}\times \frac{1000}{V}$

$1ml-1.8gm$

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

$M_1=\frac{98}{98}\times \frac{1000}{100}\times 1.8$