Question 765676: 3) Jacob has three liters of 80% acid. How much acid should he add to make a solution that is 85% acid?
2) How much water should be added to four liters of 70% alcohool to make s mixture of 28% alcohol?
4) Sarah wants to make 60% citric acid . If she has 1/2 liters of 0% citric acid, how many liters of 70% citric acid should she add?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 3) Jacob has three liters of 80% acid. How much acid should he add to make a solution that is 85% acid?
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Equation:
acid + acid = acid
0.80*3 + 1.00x = 0.85(3+x)
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Multiply thru by 100 to get:
80*3 + 100x = 85*3 + 85x
15x = 5*3
x = 1 liter (amt. of pure acid to add)
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Note:: Your next two problems can be worked the same way.
Get back to me if you have trouble.
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Cheers,
Stan H.
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2) How much water should be added to four liters of 70% alcohool to make s mixture of 28% alcohol?
4) Sarah wants to make 60% citric acid . If she has 1/2 liters of 0% citric acid, how many liters of 70% citric acid should she add?
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