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502Cells - Example 1.a I2 H2S H I S(acidic medium 1 Write...

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Lesson 22 1 Lesson 22 Example 1.a: I 2 + H 2 S H + + I + S (acidic medium) 1. Write the half-reactions I 2 I I: reduction 0 1 H 2 S H + + S S: oxidation 2 0 2. Balance all atoms, except H and O I 2 2 I H 2 S H + + S 3. Balance O by adding H 2 O (not needed) 4. Balance H by adding H + I 2 2 I H 2 S 2 H + + S 5. Balance charges by adding e I 2 + 2 e 2 I H 2 S 2 H + + 2 e + S 6. Add the two half-cell equations, canceling e I 2 + 2 e 2 I H 2 S 2 H + + 2 e + S I 2 + H 2 S 2 I + 2 H + + S Lesson 22 1. Write half-reactions I I 2 I: oxidation 1 0 H 2 SO 4 SO 2 S: reduction +6 +4 2. Balance all atoms, except H and O 2 I I 2 H 2 SO 4 SO 2 3. Balance O by adding H 2 O 2 I I 2 H 2 SO 4 SO 2 + 2 H 2 O 4. Balance H by adding H + 2 I I 2 H 2 SO 4 + 2 H + SO 2 + 2 H 2 O 5. Balance charges by adding e 2 I I 2 + 2 e H 2 SO 4 + 2 H + + 2 e SO 2 + 2 H 2 O 6. Add the two half-cell equations, canceling e - 2 I I 2 + 2 e H 2 SO 4 + 2 H + + 2 e SO 2 + 2 H 2 O H 2 SO 4 + 2 H + + 2 I SO 2 + 2 H 2 O + I 2 Example 1.b: I + H 2 SO 4 I 2 + SO 2 (acidic medium) Lesson 22 Example 1.c: CuS + NO 3 Cu 2+ + SO 4 2 + NO (acidic medium) 1. Write half-reactions
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