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How much water should be added to 18ml of 10% alcohol solution  to reduce to reduce the concentration to 9%

How much water should be added to 18ml of 10% alcohol solution  to reduce to reduce the concentration to 9%
asked 6.4k views
3 votes
How much water should be added to 18ml of 10% alcohol solution  to reduce to reduce the concentration to 9%

asked
User Subham
by
7.6k points

2 Answers

5 votes
18 * 0.1 = 1.8 ml

0.09(x + 18) = 1.8
18 + x = 20
x = 20 - 18
x = 2

2 ml.
answered
User Asharajay
by
8.1k points
3 votes

10\%=(10)/(100)=0.1\\\\0.1\cdot18ml=1.8ml-clear\ alcohol\\\\9\%=(9)/(100)=0.09\\\\w-added\ water\ (ml)\\18ml+w-9\%\ alcohol\ solution\\\\0.09(18+w)=1.8\ \ \ \ /:0.09\\18+w=20\ \ \ /-18\\w=2\\\\Answer:2ml.
answered
User Furr
by
8.5k points
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