16. what ph might you expect from a weak acid...
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.