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【单选题】
下列各溶液等体积混合后,具有缓冲作用的是 ( )A.
0.10 mol/L的HAc溶液和0.10 mol/L的NaOH溶液
B.
0.10 mol/L的NH 4 Cl溶液和0.20 mol/L的NaOH溶液
C.
0.20 mol/L的NH 4 Cl溶液和0.10 mol/L的NaOH溶液
D.
0.10 mol/L的NaAc溶液和0.10 mol/L的HCl溶液
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A.
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A.
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B.
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