Question

The pH of the aqueous solution containing $0.49$ gram of $H_{2}S{O}_4$ in one litre is:

• A. $2$
• B. $1$
• C. $1.7$
• D. $0.3$

Answer 1

Answer: (A)

$2$

For 0.49 g of sulfuric acid (molecular weight 98) molar concentration= $\frac{0.49}{98}=0.005$ moles.

Since $H_{2}S{O}_4$ contain 2 ionisable hydrogen ion, thus

$\left[H^{+}\right]=2\times 0.005=0.01M$.

$pH=-log\left[H^{+}\right]=-log\left(0.01\right)=2$.

OPtion A is correct.