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D.Discussion Questionsa.Discuss the validity of using graphical analysis to determine the Ka for phosphoric acid. b.Why is it necessary to degas the cola sample prior to titration? ReferencesBottomley, Leigh and Lawrence. Chemical Principles I & II Laboratory Manual; Hayden-McNeil: Plymouth, 2014. Voss, Matt. "Carbonation and Titration."Carbonation and Titration. Web. 21 Feb. 2015.