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【单选题】
在pH=10的氨性溶液中,用铬黑T作指示剂,用0.020mol/L的EDTA滴定同浓度的Zn2+,终点时p'Zn=6.52,则终点误差为()已知 Igk’Zny=11.05A.
-1.0E-4
B.
-2.0E-4
C.
1.0E-4
D.
2.0E-4
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