關於化學的問題欲製75%酒精100ml,需95%酒精多少ml - 酒精
By Belly
at 2006-09-11T00:00
at 2006-09-11T00:00
Table of Contents
欲製75%酒精100ml,需95%酒精多少ml?並敘述配製方法。
Tags:
酒精
All Comments
By Caroline
at 2006-09-14T07:54
at 2006-09-14T07:54
(1)體積百分率濃度(V%)
(2)重量百分率濃度(w%)
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(1)體積百分率濃度(V%)
(V%)=溶質之(體積/溶液之體積 )*100%
設取95%酒精xml,則
0.75=0.95*x/100
故x=78.95(ml)
....................................
配製法95%酒精78.95(ml)加水至100ml取
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(2)重量百分率濃度(w%)
(w%)=(溶質重/溶液重)*100%
因題目未註明75%酒精及95%酒精之比重,故無法解題。
※溶液重=溶液體積*比重
By Ida
at 2006-09-11T08:26
at 2006-09-11T08:26
2.討論氣體或酒精水溶液時,此處的%則是指體積百分率,除非在此處的%特別代表重量百分率,才需特別標明。
By Robert
at 2006-09-13T06:40
at 2006-09-13T06:40
設95%ㄉ需要 X ml
0.75*100=0.95*X
所以 X=78.9 ml
取78.9 ml+H2O至100 ml 即可
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