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Equilibrium Constant Expressions

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What are the equilibrium constant expressions for the following?

a) PCl 5 (g) <=> PCl 3 (g) + CI 2 (g)

b) Cu (OH) 2 (s) <=> Cu 2+(aq) + 20H- (aq)

c) [Cu (NH3)4]2+(aq) <=> Cu 2+(aq) + 4NH3 (aq)

d) CH3 CH2 CH2COOH (aq) + H2O (l) <=> CH3 CH2 CH2COO- (aq) + H3O+(aq)

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