单项选择题
用碘量法测定矿石中铜的含量,已知含铜约50%,若以0.10 mol/L Na2S2O3溶液滴定至终点,消耗约25 mL,则应称取矿石质量(g)为[Ar(Cu)=63.50] ( ) A.
1.3 B.
0.96 C.
0.64 D.
0.32
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