题目内容

Part III — (Paras. 7-11)The ________1_ has developed fast on campus. In order to _2_ and attract students, colleges are competing with 3___.

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A. 滴定开始;
B. 反应中间;
C. 反应结束;
D. 接近终点

A. 使Fe3+与PO4 3-生成Fe(PO4)2 3-,
B. 消除Fe3+黄色对指示剂的干扰,
C. 使Cr3+变成无色的配离子。
D. 降低了Fe3+ / Fe2+电对的电位,使滴定突跃增大,指示剂的变色准确。

A. 对
B. 错

Part III — (Paras. 7-11)The ______________1_____________ has developed fast on campus. In order to _________________2___________________ and attract students, colleges are competing with __________________3_____________.