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【单选题】
向 0.10 mol·L - 1 HCl 溶液中通入 H 2 S 气体至饱和( 0.10 mol·L - 1 H 2 S ),溶液中 S 2 - 浓度为 (H 2 S : Ka 1 =9.1×10 - 8 , Ka 2 =1.1×10 - 12 )A.
1.0×10 － 18 mol · L － 1
B.
1.1×10 － 12 mol · L － 1
C.
1.0×10 － 19 mol · L － 1
D.
9.5×10 － 5 mol · L － 1
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