已知某温度下,四种一元弱酸的电离平衡常数为:K a (HCN)=6.2×10 -10 mol/L、K a (HF)=6.8×10 -4 mol/L、K a (CH 3 COOH)=1.8×10 -5 mol/L、K a (HNO 2 )=6.4×10 -6 mol/L。物质的量浓度都为0.1 mol/L的下列溶液中,pH最小的是( )
A.
HCN
B.
CH 3 COOH
C.
HF
D.
HNO 2
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