16. what ph might you expect from a weak acid and a strong base of equal concentrations?\n○ a. 13.5\n○ b…

16. what ph might you expect from a weak acid and a strong base of equal concentrations?\n○ a. 13.5\n○ b. 3.2\n○ c. 10.4\n○ d. 7.0

16. what ph might you expect from a weak acid and a strong base of equal concentrations?\n○ a. 13.5\n○ b. 3.2\n○ c. 10.4\n○ d. 7.0

Answer

Answer:

C. 10.4

Explanation:

Step1: Analyze the reaction

When a weak acid ((HA)) reacts with a strong base ((MOH)), the reaction is (HA + MOH\rightarrow MA + H_{2}O). The salt (MA) formed undergoes hydrolysis. The anion (A^{-}) of the weak acid will hydrolyze: (A^{-}+H_{2}O\rightleftharpoons HA + OH^{-}).

Step2: Determine the pH range

Since (OH^{-}) is produced, the solution will be basic ((pH>7)). A pH of 13.5 (option A) is too high for a salt - hydrolysis - dominated solution. A weak acid - strong base salt hydrolysis does not produce a highly concentrated (OH^{-}) solution like a strong base solution. A pH of 3.2 (option B) is acidic. A pH of 7.0 (option D) is neutral. For a salt formed from a weak acid and a strong base, the solution is basic, and a pH of 10.4 (option C) is a reasonable basic pH value for such a salt solution due to the hydrolysis of the conjugate base of the weak acid.