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2. When Cr(III) is oxidized to Cr(VI), its solubility, mobility and toxicity are dramatically increased. Given the following data: Fe(OH)3(s) + e (aq) + 3H+ (aq) = Fe2+(aq) + 3H2O(l) log K 16.72 0.33HCrO4(aq) + e (aq) + 1.33H+ (aq) = 0.33Cr(OH)3(s) + 0.33H2O(l) 18.81 (a) What is the oxidation state of Fe in Fe(OH)3? 3+ (b) Determine if Fe(OH)3 may oxidize Cr(III) in solid Cr(OH)3 under standard conditions. (c) Assuming (HCrO4) = (Fe2+) = 10^-5, at what soil pH values will Cr oxidation proceed? (d) What can you conclude about the effects of soil acidity on environmental hazards of Cr? (e) What would be the effect of increasing the ratio of (HCrO4) to (Fe2+) on \(\Delta G\) for this reaction?

          2. When Cr(III) is oxidized to Cr(VI), its solubility, mobility and toxicity are dramatically increased.
Given the following data:
Fe(OH)3(s) + e (aq) + 3H+ (aq) = Fe2+(aq) + 3H2O(l)
log K
16.72
0.33HCrO4(aq) + e (aq) + 1.33H+ (aq) = 0.33Cr(OH)3(s) + 0.33H2O(l)
18.81
(a) What is the oxidation state of Fe in Fe(OH)3?
3+
(b) Determine if Fe(OH)3 may oxidize Cr(III) in solid Cr(OH)3 under standard conditions.
(c) Assuming (HCrO4) = (Fe2+) = 10^-5, at what soil pH values will Cr oxidation proceed?
(d) What can you conclude about the effects of soil acidity on environmental hazards of Cr?
(e) What would be the effect of increasing the ratio of (HCrO4) to (Fe2+) on \(\Delta G\) for this reaction?

2. When Cr(III) is oxidized to Cr(VI), its solubility, mobility and toxicity are dramatically increased.
Given the following data:
Fe(OH)3(s) + e (aq) + 3H+ (aq) = Fe2+(aq) + 3H2O(l)
log K
16.72
0.33HCrO4(aq) + e (aq) + 1.33H+ (aq) = 0.33Cr(OH)3(s) + 0.33H2O(l)
18.81
(a) What is the oxidation state of Fe in Fe(OH)3?
3+
(b) Determine if Fe(OH)3 may oxidize Cr(III) in solid Cr(OH)3 under standard conditions.
(c) Assuming (HCrO4) = (Fe2+) = 10^-5, at what soil pH values will Cr oxidation proceed?
(d) What can you conclude about the effects of soil acidity on environmental hazards of Cr?
(e) What would be the effect of increasing the ratio of (HCrO4) to (Fe2+) on Δ G for this reaction?

Added by Sheryl B.

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