A laboratory keeps two acid solutions on hand. One is 20% acid and the other is  35% acid. How many liters of distilled water should be added to a liter of 35%  acid solution in order to dilute it to 20% acid solutions? A. 0.75 L  C. 0.25 L B. 0.57 L  D. 0.45 L

Introductory Chemistry: A Foundation
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Author:Steven S. Zumdahl, Donald J. DeCoste
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Chapter15: Solutions
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Please show the complete solution using A(x%) + or - B(y%) = (A + or - B)(z%), where: A, B, and C are the amount of mixture in each container and x, y, and z are the percentage of pure stuff in each container. Thank you!

A laboratory keeps two acid solutions on hand. One is 20% acid and the other is 
35% acid. How many liters of distilled water should be added to a liter of 35% 
acid solution in order to dilute it to 20% acid solutions?
A. 0.75 L  C. 0.25 L
B. 0.57 L  D. 0.45 L

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