Question

Which of the following statement is true for 0.020 M $H_{2}S{O}_4$?

• A. 0.5 L of the solution contains 0.04 moles of $S{O}_4^{2-}$
• B. 2 L of the solution contains 0.08 moles of $H^{+}$
• C. 1 L of the solution contains 0.02 moles of $H^{+}$
• D. None of these

Answer 1

Answer: (A), (B)

The correct options are
A 0.5 L of the solution contains 0.04 moles of $S{O}_4^{2-}$
B 2 L of the solution contains 0.08 moles of $H^{+}$

We know,
$M=\frac{\text{moles of solute}}{\text{volume of solution (mL)}}\times 1000$
Given: $H_{2}S{O}_4\rightleftharpoons 2H^{+}+S{O}_4^{2-}$
0.020 moles of $H_{2}S{O}_4$ is present in 1 L of solution so
it will give 0.04 moles of $H^{+}$ and 0.02 mole of $S{O}_4^{2-}$.
2 L of the solution contains 0.08 moles of $H^{+}$ and 0.5 L of the solution contains 0.01 mole of $S{O}_{\$}^{2-}$