Question 398372
How much 15% acid solution should be added to 40 ml of a 6% solution to get a 7% acid solution?
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Equation:
acid + acid = acid
0.06*40 + 0.15x = 0.07(40+x)
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Multiply thru by 100 to get:
6*40 + 15x = 7*40 + 7x
8x = 40
x = 5 ml (amt of 15% solution needed for the mix)
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Cheers,
Stan H.