SOLUTION: How many millilitres of water much be added to 100mL of a 50% solution of sulphuric acid to make a 10% solution?

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How many millilitres of water much be added to 100mL of a 50% solution of sulphuric acid to make a 10% solution?
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let x = amt of water required to accomplish this
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Write an amt of acid equation
.50(100) = .10(100+x)
:
50 = 10 + .1x
:
50 - 10 = .1x
:
x =
x = 400 ml of water required
:
:
Check solution in the amt of acid equation
.50(100) = .10(100 + 400)
50 = .10(500)