Which of the following statements concerning aqueous solutions of salts is FALSE?

A) For any salt of a strong acid and a strong base, the pH will be about 7.

B) For any salt of a strong acid and a weak base, the pH will be <7.

C) For any salt of a weak acid and a strong base, the pH will be >7.

D) For any salt of a weak acid and a weak base, the pH will be about 7.

SA/SB=Neutral, SA/WB=Acidic, WA/SB=?, WA/WB=? Please help :)

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Jarrod RobelLv2

6 Feb 2019

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Salts formed by reaction of a strong acid with a weak base areacidic, and salts formed by reaction of a weak acid with a strongbase are basic. This is due to the equilibrium the conjugate haswith its acid or base. For example, sodium bicaronate NaHCO3contains the conjugate of the weak acid H2CO3. The conjugate willreform the acid through the equilibrium

HCO3?(aq)+H2O(aq)?H2CO3(aq)+HO?(aq)

and, thus, acts as a weak base. A solution of NaHCO3yields abasic solution.

If a salt is derived from a weak acid and a weak base, the pH ofthe solution depends on the relative acid strength (Ka) ofthe cation and base strength (Kb) of the anion. IfKa>Kb, the solution of the salt is acidic. IfKa<Kb, it is basic. If Ka?Kb, it is neutral.

Given that