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mandilynn22
03.08.2019 •
Chemistry
Achemist has one solution that is 25% salt and 75% water and another solution that is only 5% salt. how many milliliters of each should the chemist use to make 1400 ml of a solution that is 10% salt?
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Ответ:
total salt / total solution = .10
Let a be the ml of the first solution
And let b be the ml of the second solution
.25a + .05b / a + b = .10
Also:
a + b = 1400
a = 1400 - b
So substitute:
.25 x (1400 - b) + .05b / 1400 = .10
350 - .25b + 0.05b/ 1400 = .10
350 - .2b / 1400 = .10
350 - .2b = .10 x 1400
.2b = 350 - 140
.2b = 210
b = 1050
a = 1400 - b
a = 1400 - 1050
= 350 mL
Ответ:
Hope this helps :))