75%酒精配置 - 酒精
By Noah
at 2010-02-02T00:00
at 2010-02-02T00:00
Table of Contents
500ml的95%酒精,要配置成75%需要多少水?
麻煩請附上公式。
麻煩請附上公式。
Tags:
酒精
All Comments
By Vanessa
at 2010-02-03T05:23
at 2010-02-03T05:23
重量百分濃度 = 溶質重 / 溶液重
500ml ,95%,酒精重(溶液) 500 ╳ 0.789 = 394.5
設所求為X
。 374.775(溶質)
稀釋後,溶質不變:----------- = 75%
。 394.5(溶液) + X
37477.5=29587.5+75x
X=105.2ml
2010-02-02 23:19:17 補充:
Sorry,忘記打溶質算法
溶質=394.5╳95%=374.774(溶質重)
2010-02-04 17:48:41 補充:
如果95%和75%是體積莫耳濃度的話,算法就如同Extag所寫的,不過如果是重量百分率的話,你就少給了一個條件,就是酒精的比重,所以答案就會不一樣。
By Rosalind
at 2010-02-06T05:21
at 2010-02-06T05:21
By Kelly
at 2010-02-02T16:28
at 2010-02-02T16:28
By Olga
at 2010-02-05T13:06
at 2010-02-05T13:06
95% X 500 / 75% = X
X = 633
633 - 500 = 133 ml
XYZ
By Candice
at 2010-02-03T12:35
at 2010-02-03T12:35
500x75=375
475-375=100ml
因為雙方需要平衡
所以先給各方 500ml
在游 95%-75%=20%
就知道需要扣調這20%所以=475-375=100ml囉
By Tristan Cohan
at 2010-02-05T14:55
at 2010-02-05T14:55
500*95%=475
- 500*75%=375
= 475-375 =100(g)的水
...我的答對機率僅有百分之40,請見諒...
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