sping16.rtf - For questions 1-3 consider the following...

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For questions 1-3 consider the following chemical reaction: 2HCl(g) + I2(s) 2HI(g) + Cl2(g) K1 = ? 1) Which of the following is the correct expression for the equilibrium constant, K1? a. b. c. d. 2) If, at equilibrium, you find that the concentration of the products exceeds the concentration of the reactants what can you say about the value of the equilibrium constant, K1? a. K > 1 b. K < 1 c. K = 1 d. K = 0 e. K = 3) Now consider the following reaction: HI(g) + ½Cl2(g) HCl(g) + ½I2(s) K2 = ? Express the equilibrium constant for this reaction, K2, in terms of the equilibrium constant, K1, for the reaction above. a. b. c. d. e. 4) If you go into the lab and dissolve 2.11 g of magnesium chloride in enough water to make 1500 mL of solution, what is the molarity of the resulting solution? a. 1.48 x 10-2 M b. 2.35 x 10-2 M c. 6.35 x 10-2 M d. 1.41 x 10-3 M e. 2.35 x 10-5 M 5) The conjugate of a strong acid is best described as a __________, and the conjugate of a weak
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acid is best described as a____________. a. strong base, strong base b. weak base, strong base c. spectator ion, strong base d. strong base, weak base e. spectator ion, weak base City University of New York GenChemII Spring 2017 Exam 1A 3 6) Which of the following does not represent a weak acid, weak base conjugate pair? a. KHSO4, Na2SO4 b. NH4+, NH3 c. H2CO3, LiHCO3 d. HClO, NaClO2 e. All of these pairs are weak acid, weak base conjugate pairs 7) What is the [H3O+] in a solution of HI that has a pH = 3.8 at 298K? a. 6.3 x 10-11 M b. 1.6 x 10-4 M c. 2.6 x 10-1 M d. 6.3 x 103 M e. 1.6 x 1010 M 8) What is the pH of a 0.085 M solution of HF at 25°C? a. 11.9 b. 7.8
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c. 7.0 d. 2.1 e. 1.1 9) What is the pH of a 0.22 M solution of K2SO3 at 25°C? a. 3.8 b. 5.8 c. 7.0 d. 8.2 e. 10.2 10)What is the value of Ka for the conjugate acid of the weak base HPO4-2 at 298K?
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