I need help with 2b 2 Given the following two reactions and

I need help with 2b.

2. Given the following two reactions and their equilibrium constant K,=7×109 a. Evaluate the equilibrium constant for the reaction (see discussion): Cu(NH,), (aq) CO,2 (a)CuCO,(s) + 4 NH,(aq) L. 3 concentrations of all dissolved species are present, which is more stable, CuCO, or b. When 1 M Cu(NH,)422 Explain your reasoning.

Solution

b)

Cu(NH3)4²⁺(aq) + CO3^2-(aq) <------> CuCO3(s) + 4NH3(aq)

K = K2/K1 = 7×10⁹/5×10¹²= 1.4×10^-3

   K = [NH3]⁴/[Cu(NH3)4²⁺][CO3^2-] = 1.40×10^-3

^{Reaction quotient is}

     Q = [NH3]⁴/[Cu(NH3)4²⁺][CO3^2-]

When all the species concentrations are 1M

Q = (1)⁴/(1)×(1) = 1

Q>K

Therefore,

the equillibrium shift to left. So,Cu(NH3)4²⁺ is more stable.