Chem Quiz Ch 11

Chem Quiz Ch 11 - a. a. 1.00 b. b. 5.80 c. c. 1.50 d. d....

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1. Quiz 7 - Determining Reaction Progress (Points: 0.5) Consider the titration of 15.0 mL of 0.200 M phosphoric acid H3PO4 (aq) with 0.200 M sodium hydroxide NaOH (aq). What is/are the major species in solution after the addition of 15.0 mL of the base, NaOH? In the answers below: H2A^- refers to the anion with a -1 charge, HA^2- refers to a dianion with a -2 charge, and A^3- refers to the trianion with a -3 charge. a. H3PO4 (aq) b. HPO4^2- (aq) c. H3PO4 (aq) and H2PO4^- (aq) d. H2PO4^- (aq) e. PO4^3- (aq) f. H2PO4^- (aq) and HPO4^2- (aq) g. HPO4^2- (aq) and PO4^3- (aq) Save Answer 2. Quiz 7 - End point of a Titration (Points: 0.5) What is the pH at the equivalence point when 100 ml of 0.15 M hydrofluoric acid HF is titrated with 0.5 M sodium hydroxide NaOH at 298K? (Ka(HF) = 7.2 x 10-4 ) a. a. 8.1 b. b. 7.0 c. c. 8.9 d. d. 6.1 e. e. 7.9 f. f. 4.3 g. g. 5.9 h. h. 10.1 i. i. 11.1 j. j. 7.4 Save Answer 3. Quiz 7 - Progress of a titration (Points: 0.5) 100.0 mL of 0.20 M nitrous acid HNO2 (Ka = 4.0 x 10-4) is being titrated with 0.10 M sodium hydroxide NaOH. The pH after 100.0 mL of NaOH have been added is:
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Unformatted text preview: a. a. 1.00 b. b. 5.80 c. c. 1.50 d. d. 3.40 e. e. 11.95 f. f. 10.6 g. g. 8.20 h. h. 12.50 i. i. 7.00 j. j. 2.05 Save Answer 4. Quiz 7 - Solubility Product Calculations (Points: 0.5) The Ksp of silver carbonate Ag2CO3 is 8.1 x 10-12. What is the molar solubility of silver carbonate, Ag2CO3? a. 1.3 x 10^-4 b. 2.0 x 10^-6 c. 2.9 x 10^-6 d. 8.2 x 10^-12 e. 2.0 x 10^-4 Save Answer 5. Quiz 7 - Titration of a weak base (Points: 0.5) What is the pH at the stoichiometric point for the titration of 50 ml of 0.10 M methyl amine CH3NH2 (aq) with 0.10 M perchloric acid HClO4(aq)? For methyl amine (CH3NH2), Kb = 3.6 x 10^4. a. a. 5.93 b. b. 2.22 c. c. 5.78 d. d. 7.00 e. e. 2.37 Save Answer 6. Quiz 7 - What happened in this titration (Points: 0.5) At 298K, 125 ml of 0.60 M potassium hydroxide KOH is added to 175 ml of 0.20 M hydrochloric acid HCl. What is the final pH? a. a. pH = 7.0 b. b. pH = 2.6 c. c. pH = 13.1 d. d. pH = 0.9 e. e. pH = 11.4 f. f. pH = 12.3 g. g. pH = 1.7 h. h. pH = 2.2 Save Answer...
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This note was uploaded on 10/25/2010 for the course CHEM CHEM 6C taught by Professor Hoeger during the Spring '08 term at UCSD.

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Chem Quiz Ch 11 - a. a. 1.00 b. b. 5.80 c. c. 1.50 d. d....

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