Q.What is the concentration of $S^{2-}$ in a saturated solution of $H_2S$ ( $0.1 \text{ M}$ ) in the presence of $0.2 \text{ M } HCl$ ? ( $K_1 = 10^{-7}, K_2 = 1.3 \times 10^{-13}$ )

3.25 \times 10^{-20} \text{ M}

1.3 \times 10^{-21} \text{ M}

2.6 \times 10^{-21} \text{ M}

5.2 \times 10^{-21} \text{ M}

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Q.What is the concentration of S2−S^{2-}S2− in a saturated solution of H2SH_2SH2​S (0.1 M0.1 \text{ M}0.1 M) in the presence of 0.2 M HCl0.2 \text{ M } HCl0.2 M HCl? (K1=10−7,K2=1.3×10−13K_1 = 10^{-7}, K_2 = 1.3 \times 10^{-13}K1​=10−7,K2​=1.3×10−13)