Question

cid-Base Properties of Salts, and Buffers Use the References to access important values if needed for this question. An acid-base equilibrium system is created by dissolving 0.50 mol CH3CO,H in water to a volume of 1.0 L. What is the effect of adding 0.50 mol CH3CO2 (aq) to this solution? 1. The pH of the solution will equal 7.00 because equal concentrations of a weak acid and its conjugate base are present. Some CH,CO, H(aq) will ionize, increasing the concentration of CH,CO, (aq) and increasing the pH. Some CH,CO2 (aq) will react with H20", increasing the concentration of CH,CO,H(aq) and reestablishing the solution equilibrium. O1 only O 3 only 1, 2, and 3 1 and 3 2 only Submit Answer 1 question attempt remaining

Answer 1

CH seoon - Auded C H3 COOH + H2O = CH3C001-' + H30+ > Will vetarm CH3COOH . and H2o Now, the ets cooh is a weak acit, CH3COOH = CHz Cooca +14+ ka = [CH3C004] [H+] [erz.coon] Due to additian at [CH3 Cool-1, the numeralar will increase and thus to maintain the ka cansteunt, by Pallawing Le chât- eliars principal same it will cambine with CH3Coon to farm els Cool - Hence, in other wards the [CH3COOH] will increase, and the reactian will favour backward, and [HI] will decreare, and it will increane. This is called cammanian effect Canelusion Hence anly option and optian is Carrect. That means the 3rd statement is the only carreet statement.