The Acid Dissociation Constant for a Weak Acid HX at 23°C

question 122

Multiple Choice

The acid dissociation constant for a weak acid HX at 23°C is 4.78 * 10^-8. Calculate the free energy of formation for X^-(aq) at 23°C. The standard free energies of HX(aq) and H⁺(aq) at 23°C are -252.2 kJ/mol and 0, respectively.

• A) -294 kJ/mol
• B) -234 kJ/mol
• C) -211 kJ/mol
• D) 211 kJ/mol
• E) 294 kJ/mol

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