1 . 一定条件下,利用浓溴水与苯酚反应,可测定工业废水中苯酚的含量(其他杂质不与浓溴水反应)。实验步骤如下:
①用酸式滴定管准确量取20.00mL待测废水于100mL锥形瓶中;
②向锥形瓶中迅速加入过量的
浓溴水,塞紧瓶塞,振荡;
③打开瓶塞,向锥形瓶中迅速加入过量的
溶液,塞紧瓶塞,振荡;
④滴入2~3滴指示剂,再用
标准溶液滴定至终点,消耗
溶液
,发生反应:
;
⑤待测废水换为蒸馏水进行空白实验,重复上述步骤,消耗
溶液
。
废水中苯酚含量(
)表达式正确的是
①用酸式滴定管准确量取20.00mL待测废水于100mL锥形瓶中;
②向锥形瓶中迅速加入过量的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef1febd6500a4e8248b040287670fd3.png)
③打开瓶塞,向锥形瓶中迅速加入过量的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafbca77d91212f7481682b79788f392.png)
④滴入2~3滴指示剂,再用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafae911f52d73fe14024a3ee8015e30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5414fb67ab35d9a892fbb772ad3b6a60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1866824a55cdcd07785c6ab3cd52a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a28fd9abd730d80ec62a1cfacdce079.png)
⑤待测废水换为蒸馏水进行空白实验,重复上述步骤,消耗
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5414fb67ab35d9a892fbb772ad3b6a60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e39167e58c6ac3f0d95701e302c706.png)
废水中苯酚含量(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c366a9cdc508080e2aaae0018c7b15.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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