SOLUTION: how much water i have to add so that my 70% concentrated H.Cl solution becomes 50% concentrated solution ?

Question 780270: how much water i have to add so that my 70% concentrated H.Cl solution becomes 50% concentrated solution ?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
how much water i have to add so that my 70% concentrated H.Cl solution becomes 50% concentrated solution ?
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Equation::
Assuming you have 20ml of 70% HCL,
water + water = water
0.30*20 + 1*x = 0.50(20+x)
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30*20 + 100x = 50*20 + 50x
50x = 20*20
50x = 400
x = 8 ml
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Cheers,
Stan H.
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