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【单选题】
常温下，下列有关溶液的说法不正确的是A.
某物质的水溶液中由水电离出的c(H + )＝1×10 -a mol/L，若a＞7，则该溶液的pH为a或14－a
B.
将0.2 mol/L的某一元弱酸HA溶液和0.1mol/L NaOH溶液等体积混合后溶液中存在：2c(OH － )+ c(A － )＝2c(H + )＋c(HA)
C.
pH＝3的二元弱酸H 2 R溶液与 pH＝11的NaOH溶液混合后，混合液的pH等于7，则混合液中c(R 2- ) > c(Na + ) > c(HR - )
D.
相同温度下，0.2mol/L的醋酸溶液与0.1mol/L的醋酸溶液中c(H + )之比小于2：1
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A.
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B.
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D.
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A.
since
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once
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unless
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D.
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