Chemical And Ionic Equilibrium Result Question 12

Answer:

Correct Answer: 12. ( d )

Solution:

$\begin{aligned} \mathrm{pH}=1 \therefore\left[\mathrm{H}^{+}\right] & =10^{-1}=0.1 \mathrm{M} \\ \mathrm{pH} & =2 \therefore\left[\mathrm{H}^{+}\right]=10^{-2}=0.01 \mathrm{M} \end{aligned}$

For dilution of $\mathrm{HCl}, M_1 V_1=M_2 V_2$

$\begin{aligned} 0.1 \times 1 & =0.01 \times V_2 \\ V_2 & =10 \mathrm{~L} \end{aligned}$

Volume of water to be added $=10-1=9 \mathrm{~L}$