Question

PL 1 UUIZ 1. (3pts) Consider the following aqueous equilibrium for a tom llowing aqueous equilib r aformic acid solution: HCOH (aq) + H + HCO3 (aq) Suppose solid sodium formate Nuc ppose solid sodium formate, NaHCO2, is added to th e d to the solution. Which of the following statements regarding the resulting solution is nor correct ing the resulting solution is not correct? Ignore any volume changes. A. The pH decreases. B. The H' concentration decreases. C. The system shifts to the left to reestablish equilibrium. D. The HCO,H concentration increases. E. The value of K, does not change. 2. (3pts) Which of the following salts does not produce a basic solution when dissolved in water? A. KNO D. K.CO В. KBr E. KCIO C. KS 3. (3pts) Which one of the following salts, when one mole is dissolved in water, produces the solution with the lowest pH? A. KCI D. CaCl2 B. H:SO E. AICI: C. LiOH 4. (3pts) Suppose an aqueous solution initially contains one mole of hydrochloric acid and one mole of ammonia. Which of the following statements best describes the solution once it comes to equilibrium? A. The solution is neutral because the ammonia neutralizes the hydrochloric acid. B. The solution is highly acidic due to the ionization: HCl(aq) + (aq) + Cl" (aq) C. The solution is slightly acidic due to the equilibrium: NH4+ (aq) = NH, (aq) + H+ (aq) D. The solution is slightly basic due to the equilibrium: NH, (ag) + H20 (1) S NHA' (aq) + HO" (aq) E. The solution is slightly basic due to the equilibrium: Cl(aq) + H20 (1) 5 HCl(aq) + HO (ag)

Answer 1

1) The answer that is not correct is A. A base compound is being added, therefore the pH increases.

2) KNO2 produces the NO2- ion that hydrolyzes and forms a basic solution (not neutral). Option A.

3) Option B. H2SO4 produces the solution with the lowest pH.

4) Option C. It is slightly acidic.

If you liked the answer, please rate it in a positive way, you would help me a lot, thank you.