Question

Write an equation for the reaction of each of the following with water a) HNO_3 b) HCOOH c) NaOH d) NH_3 (2) Identify the conjugate acid-base pairs in each of the following chemical reactions: a) NH_4^+(aq) + CN^-(aq) NH_3(aq) + HCN(aq) b) CO_3^2-(aq) + HCI(aq) HCO_3^-(aq) + CI^_(aq) c) HCI(aq) + OH^-(aq) H_2O(aq) + CI^-(aq) (3) Classify each of the following as Bronsted acid, Bronsted base, or both in aqueous solution: a) NH_4^+ b) NH_3 c) H_2CO_3 d) HCO_3^- e) CO_3^2- (4) Calculate the pH of a solution that is: a) 1.0 times 10^-2 M in HCI b) 1.0 times 10^-3 M in NaOH (5) Calculate both [H_3O^+] and [OH^-] for a solution for which: a) pH = 1.30 b) pH = 9.70 (6) Write an equation to represent the neutralization of an aqueous solution of HNO_3 with an aqueous solution of NaOH. (7) Which of the following are capable of forming a buffer solution? a) NH_3 and NH_4CI b) HNO_3 and KNO_3 c) HBr and MgCI_2 d) H_2CO_3 and NaHCO_3 (8) What is [H_3O^+] for a buffer solution that is 0.200 M in acid and 0.500 M in the corresponding slat if the weak acid Ka = 5.80 times 10^7? (9) In the following reaction, CI_2(aq) + 2KI(aq) rightarrow 2KCI(aq) + I_2(aq) (a) identify the oxidizing agent and reducing agent; (b) write the oxidation and reduction half-reactions for the equation.

Answer 1

1.

(a) HNO₃ + H₂O $\rightleftharpoons$ H₃O⁺ + NO₃^-

(b)  HCOOH + H₂O $\rightleftharpoons$ HCOO^- + H₃O⁺

(c) NaOH + H₂O $\rightleftharpoons$ Na⁺ + OH^-

(d) NH₃ + H₂O $\rightleftharpoons$  NH₄⁺ + OH^-

2.

(a) NH₄⁺(aq) + CN^-(aq) $\rightleftharpoons$  NH₃(aq) + HCN(aq)

HCN - Acid , CN^- - conjugated base

NH₃ - Base, NH₄⁺ - conjugated acid

(b) CO₃^2-(aq) + HCl(aq) $\rightleftharpoons$ HCO₃^-(aq) + Cl^-(aq)

HCl - Acid , Cl^- - conjugated base

CO₃^2-  - Base, HCO₃^- - conjugated acid

(c) HCl(aq) + OH^-(aq) $\rightleftharpoons$ H₂O(aq) + Cl^-(aq)

HCl - Acid , Cl^- - conjugated base

OH^-  - Base, H₂O  - conjugated acid

4+3 = 7 subparts answered.