Name each of the following compounds.
Chemistry of Solutions 202-NYB-05 Lecture no. 10 Date: September 27, 2016 Prof.: N. Schoonhoven Topics Covered: percent dissociation, bases, polyprotic acids. Percent Dissociation: Effect of Dissociation HA ⟺ H + A - [HA] = [HA] – x ≈ [HA] o o [H+] = [A-] = x Ka = [H+]×[A-] ÷ [HA] = (x) (x) ÷ [HAo Dilute HA by a factor of 10: + - [H ]new= [A new= x/10, and [HA] new= [HA]o/10. Since Q < K a eqm shifts right, so more dissociation occurs. + - Q new= [H ]×[A ] ÷ [HA] = (x/10) (x/10) ÷ ([Ho] /10) =aK /10 Exercise: A 0.100 M aqueous solution of lactic acid (a monoprotic acid) is 3.7% dissociated. What is K a + % dissociation = [H ] ÷ [HA]o× 100% + (3.7%) = ([H ] ÷ (0.100)) ×100% (