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Unformatted text preview: + ] than the gastric juice. 3. Phosphoric acid is tribasic, with p K a ’s of 2.14, 6.86, and 12.4. The ionic form that predominates at pH 3.2 is: A) H 3 PO 4 . B) H 2 PO 4 – . C) HPO 4 2– . D) PO 4 3– . E) none of the above. 4. A 1.0 M solution of a compound with 2 ionizable groups (p K a’s = 6.2 and 9.5; 100 mL total) has a pH of 6.8. If a biochemist adds 60 mL of 1.0 M HCl to this solution, the solution will change to pH: A) 5.60 B) 8.90 C) 9.13 D) 9.32 E) The pH cannot be determined from this information. 5. Draw the titration curve for a weak acid, HA, whose p K a is 3.2. Label the axes properly. Indicate with an arrow where on the curve the ratio of salt (A – ) to acid (HA) is 3:1. What is the pH at this point?...
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This note was uploaded on 12/24/2011 for the course BB 490 taught by Professor Staff during the Spring '11 term at Oregon State.
- Spring '11