4. how many litres of a 90% solution of concentrated acid needs to be mixed with a 75% solution of concentrated acid to get a 30l solution of 78% concentrated acid?
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ratio=90-78:78-75
=12:3
12x+3x=30lit.
x=2.
thus 3*2=6 lit of 90% concentrated acid
ratio=90-78:78-75
=12:3
12x+3x=30lit.
x=2.
thus 3*2=6 lit of 90% concentrated acid
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