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Unformatted text preview: Fundamentals of Analytical Chemistry: 8 th ed. Chapter 16 Chapter 16 16-1 Carbon dioxide is not strongly bonded by water molecules, and thus is readily volatilized from aqueous solution by briefly boiling. On the other hand, HCl molecules are fully dissociated into H 3 O + and Cl- when dissolved in water. Neither the H 3 O + nor the Cl- species is volatile. 16-2 Nitric acid is seldom used as a standard because it is an oxidizing agent and thus will react with reducible species in titration mixtures. 16-4.Near the equivalence point in the titration of Na 2 CO 3 , the solution contains a buffer made up of a high concentration of H 2 CO 3 and a small amount of Na 2 CO 3 . Boiling removes the H 2 CO 3 as CO 2 , which causes the pH of the solution to rise sharply (see Figure 16-1). Then the change in pH, when titration is resumed, is much greater than it would otherwise be. Thus, a sharper end point results....
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This note was uploaded on 04/27/2011 for the course HUM 10 taught by Professor Bantay during the Spring '11 term at Mapúa Institute of Technology.
- Spring '11