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【单选题】
用0.1 mol·L -1 NaOH滴定0.1 mol·L -1 HAc(P Ka= 4.7)时的pH突跃范围为7.7~9.7,由此可以推断用0.1 mol·L -1 NaOH滴定P Ka 为3.7的0.1 mol·L -1 某一元酸的pH突跃范围是 ( )A.
6.7~8.7;
B.
6.7~9.7;
C.
6.7~10.7;
D.
7.7~9.7
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A.
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