4. Which is the best acid to use in the preparation of a buffer with pH = 9.3? A. CH3NH2 (Kb = 3.7 × 10–4) B. NH3 (Kb = 1.8 × 10–5) C. NH2OH (Kb = 9.1 × 10–9) D. C6H5NH2 (Kb = 4.3 × 10–10)

What is the pH of a saturated solution of Fe(OH)2?  For Fe(OH)2, Ksp = 8.0 x 10–16 . a. 9.93 b. 8.37 c. 7.23 d. 9.07 e. 10.15

Simplify   . Assume the denominator is not equal zero.

Write a balanced half-reaction for the reduction of CrO42–(aq) to Cr(OH)3(s) in a basic solution. a. CrO42–(aq) + 3 OH–(aq) + 3 e– -> Cr(OH)3(s) + 2 O2(g) b. CrO42–(aq) + 3 H+(aq) + 3 e– -> Cr(OH)3(s) c. CrO42–(aq) + 3 H+(aq) -> Cr(OH)3(s) + 2 e– d. CrO42–(aq) + 4 H2O(l) + 3 e– -> Cr(OH)3(s) + 5 OH–(aq) e. CrO42–(aq) + 3 OH–(aq) -> Cr(OH)3(s) + 2 O2(g)

Find the degree of the following polynomial    .

Which of the following is correct for the condensation of gaseous water at 88°C?  The normal boiling point of water is 100°C. a. ΔH < 0, ΔS > 0, and ΔG > 0. b. ΔH < 0, ΔS < 0, and ΔG < 0. c. ΔH > 0, ΔS < 0, and ΔG < 0. d. ΔH = 0, ΔS = 0, and ΔG < 0. e. ΔH > 0, ΔS > 0, and ΔG > 0.

What is the pH of the final solution when 25 mL of 0.021 M HCl has been added to 35 mL of 0.036 M HCl at 25°C? a. 3.3 b. 1.9 c. 1.5 d. 2.7 e. 3.5

For the reaction NO(g) + ½ O2(g)  ⇌ NO2(g) at 750°C, what is the relationship between Kc and Kp? a. Kc = Kp b. Kc = Kp x (RT)–½ c. Kc = Kp = 1.0 d. Kc = Kp x (RT)¾ e. Kc = Kp x (RT)½  

For the second-order reaction below, the initial concentration of reactant A is 0.24 M. If the rate constant for the reaction is 1.5 x 10–2 M–1s–1, what is the concentration of A after 265 seconds?   2A -> B + C rate = k[A]2   a. 0.12 M b. 0.19 M c. 0.95 M d. 4.0 M e. 5.2 M

Which are the Brønsted–Lowry acids in the following equilibrium? CH3COO–(aq) + H2O(l)  ⇌ CH3COOH(aq) + OH–(aq) a. CH3COO– and OH– b. H2O and OH– c. H2O, CH3COOH, and OH– d. CH3COO– and CH3COOH e. H2O and CH3COOH