You can
put this solution on YOUR website!how much alcohol must a nurse add to 10ml of a 60% alcohol solutions to strengthen it to 90% solution?
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Equation:
alcohol + alcohol = alcohol
0.60*10 + 1*x = 0.9(10+x)
Multiply thru by 10 to get:
6*10 + 10x = 9*10+9x
x = 3*10
x = 30ml (amt. of pure alcohol needed)
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Cheers,
Stan H.
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