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15问答网 > 影响碘量法测定硫酸铜含量准确度的因素有哪些

影响碘量法测定硫酸铜含量准确度的因素有哪些

2025-04-08 04:23:54

推荐回答（1个）

回答1：

标定：
于250mL碘量瓶加入100mL水1gKI 加入10.00mL 0.02500mol/L重铬酸钾(1/6K2Cr2O7)标准溶液、5mL(1+5)硫酸溶液密塞摇匀于暗处静置5钟用待标定硫代硫酸钠溶液滴定至溶液呈淡黄色加入1mL淀粉溶液继续滴定至蓝色刚褪止记录用量
K2Cr07十6KI十7H2S04＝4K2S04十Cr2(S04)3十3I2十7H20
CNa2S203＝15.00×0.0250／VNa2S203
式：C—硫代硫酸钠溶液浓度(mol/L)
V—滴定消耗硫代硫酸钠溶液体积(mL)
种提问觉没意义
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