SOLUTION: A lab tech has one solution that is 45% acid and another that is 70 % acid. How much of each is needed to make 100 mL of a 65% acid solution?

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Question 508935: A lab tech has one solution that is 45% acid and another that is 70 % acid. How much of each is needed to make 100 mL of a 65% acid solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A lab tech has one solution that is 45% acid and another that is 70 % acid.
How much of each is needed to make 100 mL of a 65% acid solution?
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Equation:
acid + acid = acid
0.45x + 0.70(100-x) = 0.65*100
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Multiply thru by 100 to get:
45x + 70*100 - 70x = 65*100
5*100 = 25x
x = 20 mL (amt of 45% solution needed)
100-x = 80 mL (amt of 70% solution needed)
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cheers,
Stan H.
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