a laboratory technician needs to make a 126 liter batch of a 20% acid solution
how can the laboratory tech combine a batch of an acid solution that is pure acid with another that is 10% to get the desired concentration?
show all steps and equations please
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Let x = liters of pure acid (100%)
Let y = liters of 10% acid
x + y = 126
100%x + 10%y = 20%(126)
(1)x + (0.1)y = (0.2)(126)
x + 0.1y = 25.2
Now substitute: y = 126 - x into the equation
x + (0.1)(126 - x) = 25.2
x + 12.6 - 0.1x = 25.2
0.9x = 12.6
x = 12.6/0.9 = 14 liters of pure acid
y = 126 - 14 = 112 liters of 10% acid
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