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【单选题】
已知K (NH3·H2O) = 1.8 ×10 - 5 ,在0.10 mol·L - 1 NH4Cl溶液中,c ( H + )为:A.
5.6 ×10 - 10 mol·L - 1 ;
B.
1.3 ×10 - 10 mol·L - 1 ;
C.
9.9 ×10 - 5 mol·L - 1 ;
D.
7.5 ×10 - 6 mol·L - 1 。
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