環管系及應化系請進 - 酒精
By Anthony
at 2009-09-26T00:00
at 2009-09-26T00:00
Table of Contents
95%酒精如何配置成75%酒精 請寫出95%酒精和水的比例 並寫出算式
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酒精
All Comments
By Jacob
at 2009-09-29T01:40
at 2009-09-29T01:40
(95/100+X) = 0.75,95是實際酒精量、100+X是稀釋後重量,酒精量/稀釋後總重=75%
X = 26.67克(每100克95%酒精要加入26.67克水)
重量比 = 95%酒精:水 = 100:26.67 = 大約3.75:1
體積比您就再把3.75/95%酒精密度就可以換算得到。
而網友常說95%酒精:水 = 3:1
(1)假設是重量
95%酒精:水 = 75克:25克
實際酒精濃度 = 75*0.95/100 = ~71%
(2)假設是體積比、假設95%酒精密度0.8g/mL
95%酒精:水 = 75mL:25mL
95%酒精 = 60克
實際酒精濃度 = 60*0.95/(60+25) = ~67%
算起來以重量比、秤重來配置比較接近75%酒精
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