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Calculate the silver ion concentration, [Ag+], of a solution prepared by dissolving 1.00 g of AgNO3 and 10.0 g of KCN in sufficient water to make 1.00 L of solution. (Hint: Because Kf is very large, assume the reaction goes to completion then calculate the [Ag+] produced by dissociation of the complex.)

Question

Calculate the silver ion concentration, [Ag+], of a solution prepared by dissolving 1.00 g of AgNO3 and 10.0 g of KCN in sufficient water to make 1.00 L of solution. (Hint: Because Kf is very large, assume the reaction goes to completion then calculate the [Ag+] produced by dissociation of the complex.)

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Solution

To solve this problem, we need to follow these steps:

  1. Calculate the number of moles of AgNO3 and KCN.

    The molar mass of AgNO3 is approximately 169.87 g/mol and that of KCN is approximately 65.12 g/mol.

    Moles of AgNO3 = 1.00 g / 169.87 g/mol = 0.00588 mol Moles of KCN = 10.0 g / 65.12 g/mol = 0.153 mol

  2. Determine the reaction.

    The reaction between AgNO3 and KCN is as follows: AgNO3 + KCN -> Ag(CN)2- + KNO3.

    From the reaction, we can see that one mole of AgNO3 reacts with one mole of KCN to form one mole of Ag(CN)2- and one mole of KNO3.

  3. Determine the limiting reactant.

    Since we have more moles of KCN than AgNO3, AgNO3 is the limiting reactant. Therefore, all of the AgNO3 will react with the KCN to form Ag(CN)2-.

  4. Calculate the concentration of Ag+.

    Since the reaction goes to completion, all of the AgNO3 will react to form Ag(CN)2-. Therefore, the concentration of Ag+ in the solution is the same as the concentration of Ag(CN)2-.

    [Ag+] = moles of AgNO3 / volume of solution in L = 0.00588 mol / 1.00 L = 0.00588 M

So, the silver ion concentration, [Ag+], of the solution is 0.00588 M.

This problem has been solved

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