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CaSO 4 (s) Ca 2+ (aq) + SO 4 2- (aq) solid solid +x +x solid x x x ( x) = 6.1 x 10-5 Solubility is M Determine the solubility of CaCl 2 in a M Na 2 SO 4 solution.ħ Determine the solubility of CaSO 4, K sp = 6.1 x 10-5, in a M Na 2 SO 4 solution. Determine the solubility of CaCl 2 in a M Na 2 SO 4 solution.Ħ Determine the solubility of CaSO 4, K sp = 6.1 x 10-5, in a M Na 2 SO 4 solution. CuBr Cu + Br start solid change + x + x equilibrium x x 4.2 x 10-8 = (x)( x) small x approx 4.2 x 10-8 = (x)(0.050) x = 8.4 x 10-7 = 8.4 x 10-7 Mĥ Determine the solubility of CaSO 4, K sp = 6.1 x 10-5, in a M Na 2 SO 4 solution. In a saturated CuBr solution 4.2 x 10-8 = M Now, what is the solubility of CuBr in a M NaBr solution? Simply set up an equilibrium table that has a starting conc of Br = to M. In a saturated CuBr solution 4.2 x 10-8 = M Now, what is the solubility of CuBr in a M NaBr solution?Ĥ Let s start with a saturated CuBr solution. For CuBr K sp = 4.2 x 10-8 The solubility of CuBr will be lower in a 0.05 M NaBr solution than it would be in pure water.ģ Let s start with a saturated CuBr solution. Any common ion Well, the same thing happens in all equilibria. Sodium acetate and acetic acid share a common ion, the acetate ion, so the addition of sodium acetate can affect an acetic acid equilibrium. Sodium acetate also contains an acetate ion. CH 3 CO 2 H(aq) CH 3 CO 2 (aq) + H + (aq) CH 3 CO 2 Na(aq) CH 3 CO 2 (aq) + Na + (aq) The acetic acid contains an acetate ion. Buffers are made by combining an acid with its conjugate base. The ion that appears in both reactions is the common ion. Sodium acetate and acetic acid share a common ion, the acetate ion, so the addition of sodium acetate can affect an acetic acid equilibrium.Ģ Common Ion Effects If two reactions both involve the same ion, then one reaction can effect the equilibrium position of the other reaction. 1 Common Ion Effects If two reactions both involve the same ion, then one reaction can effect the equilibrium position of the other reaction.