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Question

which of the following gives the relative size of Ka and pH of a 0.10 M solution of HEX3(aq)?

HEX₃(aq) + H₂O(l) ⇌ H₃O⁺(aq) + EX₃⁻(aq)

∆G^o = +47 kJ/mol_rxn

The reaction between the acid HEX₃(aq) and water is shown above. Based on the chemical equation and the value of ∆G^o given above, which of the following gives the relative size of Ka and pH of a 0.10 M solution of HEX₃(aq)?

1. Ka = 1 and pH < 1

1. Ka << 1 and pH = 1

1. Ka > 1 and pH > 1

1. Ka << 1 and pH > 1

Answer 1

Because ∆Gº is positive, this suggest that the Ka is < 1, and the the pH will be >1.