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【单选题】
下列多元酸中(0.1mol/L)能用NaOH标准溶液分步滴定测定出各级H + 浓度的是( )。A.
草酸(K a1 =5.4×10 - 2 ,K a2 = 6.4× 10 - 5 )
B.
琥珀酸(K a1 =6.4×10 -5 ,K a2 =2.7×10 -6 )
C.
枸缘酸(K a1 =8.7×10 -4 ,K a2 =1.8×10 -5 ,K a3 =4.0×10 -6 )
D.
顺丁烯二酸(K a1 =1.5×10 -2 ,K a2 =8.5×10 -7 )
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