CHM 1301 Lecture Notes - Lecture 17: Potassium Hydrogen Phthalate, Buffer Solution, Weak Base
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Before you begin any titration, you must first standardize the titrant! Need to be sure that the titrant concentration (standard solution) is the concentration you require to do the titration. The most common chemical used to standardize a titrant is potassium hydrogen phthalate: Hc8h3o4- (aq) + oh- (aq) c8h3o42- (aq) + h2o (l) N,hc8h3o4- (aq) = noh- = 0. 003303 mol. Volumekoh = 41. 75 ml = 0. 004175 l. For titration of weak base with a strong acid: B (aq) + h3o+ (aq) bh+ (aq) + h2o (aq) For titration of weak acid with strong base: Ha (aq) + oh- (aq) a- (aq) + h2o (aq) When doing titrations, need to think of major species because they will change through the course of the titration. (1) at the beginning, major species is ha & h2o. Ph can be calculating using ka and ha. (2) during most of titration, ha and a- are the major species so it is a buffered solution.