Question

5. What is the concentration of silver(I) ion in a saturated solution of silver(I) carbonate containing 0.0030 M Na2CO3? For Ag2CO3, Ksp = 8.6 x 10-12. A) 6.0 x 10-4 M B) 2.0 x 10-'M C) 8.0 x 10-'M D) 5.4 x 10-5M E) 8.0 x 10-4M 6. Balance the following oxidation-reduction occurring in acidic solution. MnO4 (aq) + Co2+(aq) →Mn²+ (aq) + Co3+ (aq) A) B) C) D) E) MnO4 (aq) + 8 H+ (aq) + Co2+(aq) Mn²+ (aq) + 4H2O(aq) + Co3+(aq) MnO4- (aq) + 4H2(g) + 5Co2+ (aq) Mn2+ (aq) + 4H2O(aq) + 5C03+(aq) MnO4 (aq) + 8 H+ (aq) + 2Co2+(aq) Mn2+ (aq) + 4H2O(aq) + 2C03+(aq) MnO4 (aq) + Co2+ (aq) →Mn²+ (aq) + 202(g) + Co+ (aq) MnO4+ (aq) + 8H*(aq) + 5Co2+(aq) Mn2+ (aq) + 4H2O(aq) + 5Co3+ (aq) 7. The electrochemical reaction which powers a lead-acid storage battery is as follows: Pb(s) + PbO2(s) + 4H+(aq) + 28042-(aq) 2PbSO4(s) + 2H2O(1) A single cell of this battery consists of a Pb electrode and a PbO2 electrode, each submerged in sulfuric acid. What reaction occurs at the cathode during discharge? A) Pb(s) is reduced to PbSO4(s). B) PbO2(s) is oxidized to PbSO4(s). C) Pb(s) is oxidized to PbSO4(s). D) H is oxidized to H2O(1). E) PbO2(s) is reduced to PbSO4(s). 8. A zinc-copper voltaic cell is represented as follows: Zn(s) Zn2+(1.0 M) || Cu²+(1.0 M) Cu(s) Which of the following statements is false? A) The copper electrode is the anode. B) Reduction occurs at the copper electrode during discharge. C) The mass of the zinc electrode decreases during discharge. D) Electrons flow through the external circuit from the zinc electrode to the copper electrode. E) The concentration of Cu2+ decreases during discharge.

Answer 1

Ag coz 2Ag+ + Coz 2- k3p = (25) x (0.0030 ts) = 8.6x10 12 45 x 0.0030 = 8.6x10-12 S=2.68 x 10 5 (m) Taat) - 25 = 2 x 2.68x10-5 = 5.4 x10 5 (M). option {Ans) mnogo +8H+ +5e 12+ + 4H2O 5 co2 x 5 co3t te mnogo + 5 co2t +8Ht 5003t+m2+ + 4H₂O option (Am). During discharge or forward reaction, Pboz is reduced to pbsoq. option © (An). n electrode is anode and ca elechode is Cathode Anode: Z - Zn2+ the Cathode cult the cu. option is answer,