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liminxu

铜虫 (小有名气)

[求助] 问个小问题

对于文献中写的试剂摩尔比例的选取,实验的时间以及实验的温度等到底是怎么选取的呢?我看到的都是直接就把这些参数写上去了?是随意取的几个参数还是经过几次对比实验选取最佳值?
例如 The molar proportions of corn starch, acetic anhydride, glacial acetic acid and sulfuric acid were 1:3:3:0.1. The contents of the three-necked flask were stirred at 600 rpm in a thermostat water bath at 80 C for 2 h,
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