Question

5) Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [NO2]eq = 0.85 M and [NO]eq=0.38 M. 2 NO2(g) - N2048) A) 2.2 B) 1.9 C) 0.022 D) 0.22 E) 0.53 6) Which of the following statements is true? A) If Q=K, it means the reaction is not at equilibrium. B) If Q<K, it means the forward reaction will proceed to the right) to form more reactants. C) IFO <K, it means the reverse reaction will proceed to the left) to form more reactants. D) If Q> K, it means the forward reaction will proceed to the right) to form more reactants. E) If Q> K, it means the reverse reaction will proceed to the left) to form more reactants. 7) The following reaction is exothermie. Which change will shift the equilibrium to the left? 7) 2 NO2(8) N20 (8) A) decreasing the temperature B) adding NO(g) C) removing N204() D) increasing the volume (decreasing the pressure) E) adding neon Determine the pH of a 0.550 M solution of a weak acid whose Kais 3.8 x 10 A) 2.84 B) 2.09 x 10 C) 11.16 D) 5.68 E) 0.260 9) Determine the (OH) concentration in a 0.169 M solution of the strong base Ba(OH) 2 9 ) A) 0.169 M B ) 5.92 x 10"M C ) 0.338 M D) 2.96 x 10' M E) 0.298 M 8) 10) ) 2.46 E 10) Calculate the pOH of a solution that contains 3.50 x 10-'M H,O at 25°C. A) -2.46 B) 11.5 C) 16.5 D) 2.86 x 10-12 11) Calculate the pH of a buffer that is 0.300 M HCHO, and 0.500 M KCHO, The Ka for HCHO, is 1.8 x 10 A) 3.97 B) 10.03 C) 3.44 D) 3.52 E) 3.74 12) Which of the following is false? 12) A) A buffer can be composed of a weak base and its conjugate acid. B) A buffer can be composed of a weak acid and its conjugate base. C) Buffered systems are resistant to changes in pH from the addition of acid or base. D) The lower the concentration of weak acid and conjugate base, the higher the buffer capacity E) The buffer range of an acidic buffer is the weak acid's pk, +1. 13) A 1.00 L buffer solution is composed of 0.250 M HF and 0.250 M NaF. Calculate the 13) pH of the solution after the addition of 0.100 moles of gaseous HCL. Assume no volume change upon the addition of HCl. The K, for HF is 3.5 x 10 A) 3.08 B) 3.46 C) 3.82 D) 10. 18 E ) 0.37 14) 14) A sample of N(CH), is titrated with HBr. Determine the pH of the solution at the equivalence point. A) 16 B) >7 - C7 D7 E-2

Answer 1

57 ENO2Je-0.85 M CN204Je- 0.38 M / 2 NO2 (a) N204 (9) ( IN2041 CNO212 Ke= 1/S 08 Co.88] ST Co-8S R O.38 0.7225 l Ke is 0.525 Hence, the Value