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4241HW01_Key_S11

4241HW01_Key_S11 - Homework 1 Answer Sheet Points Problem 1...

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Homework 1 Answer Sheet Points Problem 1 2 a-1 CaCO 3 W Ca 2+ + CO 3 2- K sp = 4.5 x 10 -9 [Ca 2+ ] [CO 3 2- ] = 4.5 x 10 -9 Solubility = [Ca 2+ ] = [CO 3 2- ] = 6.7 x 10 -5 moles/liter 2 a-2 Atomic weight CaCO 3 = 40.08 + 12.01 + (3 x 15.998) = 100.08g (This is the weight of one mole of CaCO 3 ). 6.7 x 10 -5 moles/liter x 0.1 liters = 6.7 x 10 -6 moles 100.08 x 6.7 x 10 -6 = 6.7 x 10 -4 g/100 ml 3 b (0.1 + X) (X) = 4.5 x 10 -9 where X is the solubility of CO 3 2- X 2 << 0.1 X ˆ 0.1 X . 4.5 x 10 -9 X . 4.5 x 10 -8 moles/liter
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