###### Chemistry: Principles and Reactions

222 SOLVED PROBLEMS

Question: 17.4

## Using standard potentials from Table 17.1, decide whether at standard concentrations ⓐ the reaction 2Fe3+(aq) + 2I-(aq) → 2Fe2+(aq) + I2(s) will occur. ⓑ Fe(s) will be oxidized to Fe2+ by treatment with hydrochloric acid. ⓒ a redox reaction will occur when the following species are mixed in acidic solution: Cl-, Fe2+, Cr2+, I2. ...

ⓐ Fe: + 3 → +2   reduction I: -1 → 0          ...
Question: 17.8

## Chromium metal can be electroplated from an aqueous solution of potassium dichromate. The reduction half-reaction is Cr2O7 2-(aq) + 14H+(aq) + 12e- → 2Cr(s) + 7H2O A current of 6.00 A and a voltage of 4.5 V are used in the electroplating. ⓐ How many grams of chromium can be plated if the current is ...

ⓐ 6.00 A = 6.00 C/s 6.00\frac{C}{s}[/la...
Question: 22.11

## In the following structural formulas, locate each chiral carbon atom. ...

$C_{a}$ has three hydrogen atoms bond...
Question: 16.7

## Graded When zinc is dissolved in a strong acid, zinc ions and hydrogen gas are produced. Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g) At 25°C, calculate ⓐ ΔG°. ⓑ ΔG when PH2 = 750 mm Hg, [Zn2+] = 0.10 M, [H+] = 1.0 × 10-4 M. ⓒ the pH when ΔG = -100.0 kJ, PH2 = 0.933 atm, [Zn2+] = 0.220 M and the mass of Zn ...

ⓐ ΔG° = $ΔG°_{f}Zn^{2+}$(aq) + [l...
Question: 17.6

## GRADED Consider a voltaic cell in which the following reaction occurs: O2(g, 0.98 atm) + 4H+(aq, pH = 1.24) + 4Br-(aq, 0.15 M) → 2H2O + 2Br2(l) ⓐ Calculate E for the cell at 25°C. ⓑ When the voltaic cell is at 35°C, E is measured to be 0.039 V. What is E° at 35°C? ...

ⓐ 1.24 = -log_{10}[H^{+}];  [H^{+}][/la...
Question: 17.7

## Consider a voltaic cell at 25°C in which the reaction is Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g) It is found that the voltage is 10.560 V when [Zn2+] = 0.85 M and PH2 = 0.988 atm. What is the pH in the H2-H half-cell? ...

Zn: 0 → +2 oxidation; $[H^{+}]$: +1 →...
Question: 17.3

## GRADED Consider the voltaic cell in which the reaction is 2Ag+(aq) + Cd(s) → 2Ag(s) + Cd2+(aq) ⓐ Use Table 17.1 to calculate E8 for the voltaic cell. ⓑ If the value zero is arbitrarily assigned to the standard voltage for the reduction of Ag+ ions to Ag, what is E° red for the reduction of Cd2+ ...

ⓐ Ag: 11 → 0 (reduction) Cd: 0 → +2 (oxidation...
Question: 17.2

## CONCEPTUAL Consider the following species in acidic solution: MnO4-, I-, NO3-, H2S, and Fe2+. Using Table 17.1, ⓐ classify each of these as an oxidizing and/or reducing agent. ⓑ arrange the oxidizing agents in order of increasing strength. ⓒ do the same with the reducing agents. ...

ⓐ found in the left column, oxidizing agent [la...
Question: 17.5

## For the reaction 3Ag(s) + NO3-(aq) + 4H+(aq) → 3Ag+(aq) + NO(g) + 2H2Ouse Table 17.1 to calculate, at 25°C,ⓐ ΔG° ⓑ K ...

($E°_{ox}$ $I^{-}$ = -0....