Solve the following problem related to the solubility equilibria of some metal hydroxides in aqueous solution. the solubility of cu(oh)2(s) is 1.72 x10–6 g/100. ml of solution at 25° c.(i) write the balanced chemical equation for the dissociation of cu(oh)2(s) in aqueous solution. cu(oh)2 < ===> cu 2+ + 2 oh –(ii) calculate the solubility (in mol/l) of cu(oh)2 at 25 °c.(1.72 x10–6 g/0.100 l)(1 mol/97.5 g) = 1.76 x10–7 mol/l(iii) calculate the value of the solubility-product constant, ksp, for cu(oh)2 at 25 °c. ksp = [cu 2+][oh –]2 = [1.76 x10–7][3.53 x10–7]2 = 2.20 x10–20

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)