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【单选题】
在0.30 mol.L -1 的HCl溶液中通H 2 S至饱和，S 2－ 浓度为下列哪一项？（饱和H 2 S溶液中，H 2 S的浓度为0.10mol·L －1 ）（）A.
0.10 mol.L
B.
0.30 mol.L -1
C.
K θ a1 ·K θ a2
D.
1.1×10 －19 mol.L -1
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