This homework is due at the start of class. If you wish to use your homework for

Question

This homework is due at the start of class. If you wish to use your homework for studying for t c mid-semester exam, then make a photocopy of it before turning it in. The material covered in this homework assignment applies to processes that occur at the hart s surface. Equilibrium constants that you may need arc given below. Show all your work. A quantity of 0.5 g of solid Na_2SO_4 (which is completely soluble and dissociates to Na and SO_4^2-) is added to one liter of a solution containing 1.5 times 10^-2 moles of dissolved Pb^2+. Demonstrate that anglesite (PbSO_4) precipitates from the solution and calculate the weight of PbSO_4 in grams that will precipitate per liter. use at least 3 to 4 decimal places throughout. Equilibrium constants that may be useful.

Explanation / Answer

Na2SO4 moles = 0.5 / 142 = 3.52 x 10^-3

Pb+2 moles = 1.5 x 10^-2

Pb+2    + SO4-2 -----------------> PbSO4

1mol          1mol                           1mol

1.5x10^-2   3.52 x 10^-3                  ??

here limiting reagnet is SO4-2

so moles of PbSO4 formed = 3.52 x 10^-3

molarity is also 3.52 x 10^-3 because volume = 1 Litre

mass of PbSO4 formed in 1 L = molarity x molar mass

                                               = 3.52 x 10^-3 x 303

                                                = 1.07 g /L

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