. What is the purpose of the Ba(NO3)2 ? 2. What percent of Agl remains unprecipitated when the first amount of AgCl starts to precipitate? 3. What effect would the presence of 1 M ammonia have on the above titration? Be specific in your answer. Indicate how you would experimentally evaluate the equilibrium constant for the silver-amine complex. 4. Explain why you do not need to know the half-cell potential for the reference electrode in order to calculate the Ksp for AgCl and AgI. 5. Compare the methods that you used to determine the endpoint