SOLUTION: A chemist has one 30-L bottle of 15% hydrochloric acid and one 30-L bottle of 90% hydrochloric acid. She mixes 20 L of 60% hydrochloric acid and then pours 5L of that solution back
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Question 580876: A chemist has one 30-L bottle of 15% hydrochloric acid and one 30-L bottle of 90% hydrochloric acid. She mixes 20 L of 60% hydrochloric acid and then pours 5L of that solution back into the bottle containing the 90% hydrochloric acid. How strong is the acid in that bottle now?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A chemist has one 30-L bottle of 15% hydrochloric acid and one 30-L bottle of 90% hydrochloric acid. She mixes 20 L of 60% hydrochloric acid and then pours 5L of that solution back into the bottle containing the 90% hydrochloric acid. How strong is the acid in that bottle now?
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acid + acid = acid
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0.60*5 + 0.90*30 = x(5+30)
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3 + 27 = 35x
x = 30/35
x = 0.8571 = 85.71%
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Cheers,
Stan H.
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