Math homework help needed - show all steps and equations please

Mathematics
Tutor: None Selected Time limit: 1 Day

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

thank you!

Oct 30th, 2015

Thank you for the opportunity to help you with your question!

Let x = liters of pure acid (100%)

Let y = liters of 10% acid

x + y = 126

and

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



Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 30th, 2015

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