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calculate the mass of impure KOH needed to make up 1.20 L of 0.60 mol/L KOH(aq)? Assume the impure KOH is 84% KOH by mass and 16% water.
12 years ago

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bonjo
try this;

n = Mv = 0.6x1.2 = 0.72moles

so, 0.72moles is the total mole i.e. KOH and water. Since the impure KOH is 84%, then the mole for KOH is;

0.84 x 0.72 = 0.605moles

so, m = nMr = 0.605x(molar mass of KOH).
12 years ago

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