Homework 3

Homework 3 - than the gastric juice 3 Phosphoric acid is...

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Homework 3 -- Due Monday October 3 1. Which of the following is true about the properties of aqueous solutions? A) A pH change from 5.0 to 6.0 reflects an increase in the hydroxide ion concentration ([OH-]) of 20%. B) A pH change from 8.0 to 6.0 reflects a decrease in the proton concentration ([H+]) by a factor of 100. C) Charged molecules are generally insoluble in water. D) Hydrogen bonds form readily in aqueous solutions. E) The pH can be calculated by adding 7 to the value of the pOH. 2. The pH of a sample of blood is 7.4, while gastric juice is pH 1.4. The blood sample has: A) 0.189 times the [H + ] as the gastric juice. B) 5.29 times lower [H + ] than the gastric juice. C) 6 times lower [H + ] than the gastric juice. D) 6,000 times lower [H + ] than the gastric juice. E) a million times lower [H
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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.

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Homework 3 - than the gastric juice 3 Phosphoric acid is...

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