英语翻译Dissolve 0.250 g in 50 mL of alcohol R and add 5.0 mL of

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/18 15:27:06

英语翻译
Dissolve 0.250 g in 50 mL of alcohol R and add 5.0 mL of
0.01 M hydrochloric acid.Carry out a potentiometric titration
(2.2.20),using 0.1 M sodium hydroxide.Read the volume
added between the 2 points of inflexion.

R 代表试剂纯度（Reagent Grade）.这不是标准用法.
alcohol R 试剂纯度酒精
再问：那就是乙醇了？这个是英国药典和欧洲药典上面的一个测定药物含量里面出现的。
再答： Reagent Grade好像是欧洲用法，美国化学学会并没有规定这个标准，不过商业用纯度通常都用这个。美国实验室的标准是Reagent A.C.S. 美国化学学会试剂纯度。

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