下列说法不正确的是 A.容量瓶、量筒和滴定管上都标有使用温度,

下列说法不正确的是

A容量瓶、量筒和滴定管上都标有使用温度,量筒、容量瓶无“0”刻度,滴定管有“0”刻度;使用时滴定管水洗后还需润洗,但容量瓶水洗后不用润洗

B.在两支试管中分别加1mL无水乙醇和1.5g苯酚固体,再加等量等体积的钠,比较乙醇、苯酚羟基上氢原子的活泼性

C . 2ml 紫色的COCl2 溶液中加入浓盐酸,可使溶液显蓝色;在测定某些反应的反应速率时,可以用分光光度计对于某些有颜色的反应物或生成物进行比色分析,根据溶液颜色与反应物或生成物浓度的关系换算成反应物或生成物在不同反应时刻的浓度来计算反应速率

D.制备摩尔盐时,最后在蒸发皿中蒸发浓缩溶液,加热至液体表面出现晶膜为止,不能将溶液全部蒸干

答案

B

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