i Write the chemical equation for the reaction that occurred in the test tube

# I write the chemical equation for the reaction that

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(i) Write the chemical equation for the reaction that occurred in the test tube. (ii) Which salt has the greater value of K sp : AgBr or AgI ? Justify your answer. 1998 A (Required) Solve the following problem related to the solubility equilibria of some metal hydroxides in aqueous solution. (a) The solubility of Cu(OH) 2 (s) is 1.72 10 -6 gram per 100. milliliters of solution at 25 C. (i) Write the balanced chemical equation for the dissociation of Cu(OH) 2 (s) in aqueous solution. (ii) Calculate the solubility (in moles per liter) of Cu(OH) 2 at 25 C. (iii) Calculate the value of the solubility-product constant, K sp , for Cu(OH) 2 at 25 C. (b) The value of the solubility-product constant, K sp , for Zn(OH) 2 is 7.7 10 -17 at 25 C. (i) Calculate the solubility (in moles per liter) of Zn(OH) 2 at 25 C in a solution with a pH of 9.35. (ii) At 25 C, 50.0 milliliters of 0.100-molar Zn(NO 3 ) 2 is mixed with 50.0 milliliters of 0.300- molar NaOH. Calculate the molar concentration of Zn 2+ (aq) in the resulting solution once equilibrium has been established. Assume that volumes are additive. • • • 