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in a chemistry class 14 liters of a 12% alcohol solution must be mixed with a 20% solution to geta 13% solution how many liters of the 20% solution are needed?      .....please help, not sure how to set up

kmnicole  Mar 18, 2018
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Let the number of Liters of 20% solution = T

12%*14 + 20%*T = 13%[14 + T]

1.68 + 0.20T = 1.82 + 0.13T      subtract 0.13T from both sides

1.68 + 0.07T = 1.82                   subtract 1.68 from both sides

0.07T = 0.14                              divide both sides by 0.07

T = 2 - Liters of 20% solution will be needed to make 13% solution.

Guest Mar 18, 2018

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