题目内容

将3.000g锡矿试样, 经溶样化学处理后配制成250 mL溶液, 吸取25.0 mL试样进行极谱分析, 其极限扩散电流为24.9 μA, 然后在电解池中再加入5.0 mL 6.0×10-3mol/L的标准锡溶液, 测得混合溶液的极限扩散电流为28.3 μA, 计算试样中锡的质量分数。Mr锡=118.69 g/mol

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