Question

In: Chemistry

HCN dissociates into CN- and protons. A) What is the equilibrium constant at T=298.15 K? B)...

HCN dissociates into CN- and protons.

A) What is the equilibrium constant at T=298.15 K?

B) At what pH will the reaction move to the left if the solution contains 0.1 M HCN?

Solutions

Expert Solution

A) Since we know an equillibrium constant is related to the standard Gibbs free energy change for the reaction.

G = -RTlnK

       finding G for HCN is equal to +124.7 KJ/mol

        lnK = 124.7 / - 8.314 x 298.15

              lnK = 124.7 / - 2478.8191

      lnk = - 0.05030

                K = e(-0.05030)

                      = 0.951

B)    HCN      H+ + CN-

         At 0.1M HCN pH = 1   from pH table we get know that if H+ ions concentration increases then pH decreases here in this concerned can say reaction will get in forward direction. and if pH will be greater than 1 then reaction will move left in direction.

queen_honey_blossom answered 2 years ago
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