SOLUTION: a chemist needs a solution that is 75% acid but only has solutions that are 35% and 85% acid. If The chemist measures 120ml of the 85% solution, how many milliliters of the 35% so
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Question 367508: a chemist needs a solution that is 75% acid but only has solutions that are 35% and 85% acid. If The chemist measures 120ml of the 85% solution, how many milliliters of the 35% solution should she add to make a 75% solution? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! a chemist needs a solution that is 75% acid but only has solutions that are 35% and 85% acid. If The chemist measures 120ml of the 85% solution, how many milliliters of the 35% solution should she add to make a 75% solution?
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Equation:
acid + acid = acid
0.35x + 0.85*120 = 0.75(x+120)
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Multiply thru by 100 to get:
35x + 85*120 = 75x + 75*120
40x = 10*120
x = 30ml (amt. of 35% solution needed for the mix)
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Cheers,
Stan H.
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