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(5分)草酸晶体的组成可表示为H 2 C 2 O 4 ·xH 2 O,为测定x值,做了如下实验: ①称取W g纯草酸晶体,将其配制成100.0 mL水溶液为待测液。 ②取25.00 mL待测液放入锥形瓶中,再加入适量的稀H 2 SO 4 ③用浓度为a mol?L -1 的KMnO 4 标准溶液进行滴定,滴定时发生的反应为: ...