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【单选题】
用0.1120 mol/L Na 2 S 2 O 3 标准溶液滴定24.48 mL I 2 溶液，消耗Na 2 S 2 O 3 溶液23.31 mL，计算I 2 溶液的浓度 相关反应：I 2 +2Na 2 S 2 O 3 =2NaI + Na 2 S 4 O 6 计算公式应该是： 公式中的 a 为：A.
1
B.
2
C.
3
D.
4
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