7. Manganese(II) ions and tin (II) ions can react under the right conditions. Given are the oxidation and reduction half-reactions for such a system. Mn2+ + 4H,0 - 8H* + MnO+ 5e Sn2+ + 2e - Sn (s) OVERALL: a. Label each of the half-reactions as either oxidation or reduction. b. Write the overall reaction and state how many electrons were transferred. c. Suppose 5.00 grams of Mn(NO,), was dissolved in 2500. mL of water and reacted completely with excess Sn2+ ions. i. Why isn't nitrate included in the half reactions above?

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7. Manganese(II) ions and tin (II) ions can react under the right conditions. Given are the oxidation and reduction
half-reactions for such a system.
Mn2+ + 4H,O
8H* + MnO4 + 5e
Sn2+ +2e →
Sn (s)
OVERALL:
a.
Label each of the half-reactions as either oxidation or reduction.
b. Write the overall reaction and state how many electrons were transferred.
c. Suppose 5.00 grams of Mn(NO,), was dissolved in 2500. mL of water and reacted completely with excess
Sn2* ions.
i.
Why isn't nitrate included in the half reactions above?
ii.
How many grams of solid tin will be formed?
Calculate the approximate* pH of the final solution assuming it started as neutral and that the
system could react to completion.
ii,
*This means we are assuming there is no formation of complex ions with water (because they are not
included on the AP exam!! These would actually affect the pH a bit too, but not in a serious way). Also,
HMNO, is actually a "secret" strong acid that no one cares about. Think about what that means for the
effect that the MnO; ion has on pH.
9
Transcribed Image Text:7. Manganese(II) ions and tin (II) ions can react under the right conditions. Given are the oxidation and reduction half-reactions for such a system. Mn2+ + 4H,O 8H* + MnO4 + 5e Sn2+ +2e → Sn (s) OVERALL: a. Label each of the half-reactions as either oxidation or reduction. b. Write the overall reaction and state how many electrons were transferred. c. Suppose 5.00 grams of Mn(NO,), was dissolved in 2500. mL of water and reacted completely with excess Sn2* ions. i. Why isn't nitrate included in the half reactions above? ii. How many grams of solid tin will be formed? Calculate the approximate* pH of the final solution assuming it started as neutral and that the system could react to completion. ii, *This means we are assuming there is no formation of complex ions with water (because they are not included on the AP exam!! These would actually affect the pH a bit too, but not in a serious way). Also, HMNO, is actually a "secret" strong acid that no one cares about. Think about what that means for the effect that the MnO; ion has on pH. 9
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