a chemistry experiment calls for 30% sulfuric acid solution. if the supply room has only 50% and 20% sulfuric acid solution on hand,how much of each should be mixed to obtain 12 litres of 30% solution?

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  1. Think of the total amounts of solute in the various concentrations. If you mix them, you get

    .5x + .2(12-x) = .3(12)
    .3x = 1.2
    x = 4

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