Please help with 21 and 22 Solid ammonium carbonate is slowly added to 125 mL of

Question

Please help with 21 and 22 Solid ammonium carbonate is slowly added to 125 mL of a iron(II) acetate solution until the concentration of carbonate ion is 0.0233 M. What is the maximum amount of iron(II) ion remaining in solution? Consider the insoluble compound silver bromide, AgBr The silver ion also forms a complex with cyanide ions. Write a balanced net ionic equation to show why the solubility of AgBr (s) increases in the presence of cyanide ions and calculate the equilibrium constant for this reaction. For Ag(CN)_2, K_f = 5.6 times 10^18.

Explanation / Answer

21. The strength of Fe(II) acetate is missing in the question.

22. AgBr+2NaCN=Na[Ag(CN)2]+ NaBr As AgBr is forming a complex it's becoming soluble. So according to La Chatelier principle more AgBr will be in solution by complex formation.

Equilibrium constant of the reaction will be same as the formation constant of [Ag(CN)2]- ie 5.6*1018

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