Question

100 mL of 0.01 M $H_{2}S$ solution is taken to which the following quantities of 1.0 M NaOH have been added. $K_1(H_{2}S={10}^{-7},K_2(H_{2}S)={10}^{-14}$. Match the following.
Column I : Volume of NaOH added
Column II : pH

Answer 1

When 0.0 mL of 1.0 M NaOH solution is added to 100 mL of 0.01 M $H_{2}S$ solution, the pH of the resulting solution is 4.5.
When 0.5 mL of 1.0 M NaOH solution is added to 100 mL of 0.01 M $H_{2}S$ solution, the pH of the resulting solution is 7.0.
When 1.0 mL of 1.0 M NaOH solution is added to 100 mL of 0.01 M $H_{2}S$ solution, the pH of the resulting solution is 9.5.
When 1.5 mL of 1.0 M NaOH solution is added to 100 mL of 0.01 M $H_{2}S$ solution, the pH of the resulting solution is 11.7.