The pH of a 0.100 M solution of an aqueous weak acid (HA) is 3.20. What is K_a for the weak acid? A) 4.0 * 10^-⁶ B) 6.3*10^-⁴ C) 7.2 *10^-⁵ D) 3.2 E) none of these

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The correct answer is A because the pH of a solution is a measure of its acidity or alkalinity. The pH scale ranges from 0 to 14, with 7 being neutral. A pH less than 7 indicates an acidic solution, while a pH greater than 7 indicates an alkaline solution. The pH of a solution is determined by the concentration of hydrogen ions (H+) in the solution. The higher the concentration of hydrogen ions, the lower the pH. The Ka of a weak acid is a measure of its strength. The higher the Ka, the stronger the acid. The Ka of a weak acid can be calculated using the following equation:Ka = [H+][A-] / [HA]where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base of the acid, and [HA] is the concentration of the acid.

The PH of a 0