Acids & Bases. Calculating Ka from % Dissociation Polyprotic Acids Properties of Salts. Example. Lactic acid (HC 3 H 5 O 3 ) is a waste product that accumulates in the muscle during exertion, leading to pain & a feeling of fatigue. A 0.100 M solution is 3.7% dissociated. Calculate K a.
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Calculating Ka from % Dissociation
Properties of Salts
HC3H5O3 H+ + C3H5O3-
H3PO4 H+ + H2PO4- Ka1 = 7.5 x 10-3
H2PO4 - H+ + HPO4-2 Ka1 = 6.2 x 10-8
HPO4 -2 H+ + PO4-3 Ka3 = 4.8 x 10-13