Question

Calculate molality of 28% W/V KOH

Answer 1

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♦STEPWISE (without FORMULA)::

♦20% KOH (aq.) by mass means 20 g KOH is dissolved in 100 g KOH solution.

♦Volume of solution = (mass of solution) / (density) = (100 g) / (1.02 g/mL)

♦Moles of Solute, KOH = (20/56)

♦Volume of solution (in L) = (100/1.02)*(1/1000) = (1/ 10.2)

♦Molarity = (20/56) / (1 /10.2) = 20 * 10.2 = 3.64 M