Supplementary Problems

Oxidation-Reduction (RedOx) Reactions: Acidic Conditions

Balance the following reactions with the lowest whole number ratio coefficients under acidic conditions.
1.	BrO₃⁻ + N₂H₄ → Br⁻ + N₂	[Solution]
2.	UO²⁺ + NO₃⁻ → UO₂²⁺ + NO	[Solution]
3.	P₄ + NO₃⁻ → H₂PO₄⁻ + NO	[Solution]
4.	S₂O₃²⁻ + MnO₄⁻ → SO₄²⁻ + Mn²⁺	[Solution]
5.	Ag⁺ + H₂CO → Ag + HCO₂H	[Solution]
6.	MnO₄⁻ + CH₃OH → Mn²⁺ + HCO₂H	[Solution]
7.	MnO₄⁻ + H₂O₂ → Mn²⁺ + O₂	[Solution]
8.	HNO₂ + Cr₂O₇²⁻ → Cr³⁺ + NO₃⁻	[Solution]
9.	Cr₂O₇²⁻ + CH₃CHO → HCO₂H + Cr³⁺	[Solution]
10.	UO²⁺ + Cr₂O₇²⁻ → UO₂²⁺ + Cr³⁺	[Solution]
11.	HS⁻ + HSO₃⁻ → S₂O₃²⁻	[Solution]
12.	CH₃CH₂OH + Cr₂O₇²⁻ → CH₃CHO + Cr³⁺	[Solution]
13.	Br⁻ + H₂SO₄ → Br₂ + SO₂	[Solution]
14.	Cr₂O₇²⁻ + SO₂ → SO₄²⁻ + Cr³⁺	[Solution]
15.	Cu + SO₄²⁻ → Cu²⁺ + SO₂	[Solution]
16.	H₂C₂O₄ + MnO₄⁻ → CO₂ + Mn²⁺	[Solution]
17.	SO₃²⁻ + MnO₄⁻ → SO₄²⁻ + Mn²⁺	[Solution]
18.	As₂O₃ + NO₃⁻ → H₃AsO₄ + NO	[Solution]
19.	CH₃CH₂OH + CrO₃ → CH₃CHO + Cr³⁺	[Solution]
20.	S₂O₃²⁻ + Cl₂ → SO₄²⁻ + Cl⁻	[Solution]

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Solutions


1.	2BrO₃⁻ + 3N₂H₄ → 2Br⁻ + 3N₂ + 6H₂O	[Back to Questions]



2.	3UO²⁺ + 2NO₃⁻ + 2H⁺ → 3UO₂²⁺ + 2NO + H₂O	[Back to Questions]



3.	3P₄ + 20NO₃⁻ + 8H⁺ + 8H₂O → 12H₂PO₄⁻ + 20NO	[Back to Questions]



4.	5S₂O₃²⁻ + 8MnO₄⁻ + 14H⁺ → 10SO₄²⁻ + 8Mn²⁺ + 7H₂O	[Back to Questions]



5.	2Ag⁺ + H₂CO + H₂O → 2Ag + HCO₂H + 2H⁺	[Back to Questions]



6.	4MnO₄⁻ + 5CH₃OH + 12H⁺ → 4Mn²⁺ + 5HCO₂H + 11H₂O	[Back to Questions]



7.	2MnO₄⁻ + 5H₂O₂ + 6H⁺ → 2Mn²⁺ + 5O₂ + 8H₂O	[Back to Questions]



8.	3HNO₂ + Cr₂O₇²⁻ + 5H⁺ → 2Cr³⁺ + 3NO₃⁻ + 4H₂O	[Back to Questions]



9.	Cr₂O₇²⁻ + CH₃CHO + 8H⁺ → 2HCO₂H + 2Cr³⁺ + 4H₂O	[Back to Questions]



10.	3UO²⁺ + Cr₂O₇²⁻ + 8H⁺ → 3UO₂²⁺ + 2Cr³⁺ + 4H₂O	[Back to Questions]



11.	2HS⁻ + 4HSO₃⁻ → 3S₂O₃²⁻ + 3H₂O	[Back to Questions]



12.	3CH₃CH₂OH + Cr₂O₇²⁻ + 8H⁺ → 3CH₃CHO + 2Cr³⁺ + 7H₂O	[Back to Questions]



13.	2Br⁻ + H₂SO₄ + 2H⁺ → Br₂ + SO₂ + 2H₂O	[Back to Questions]



14.	Cr₂O₇²⁻ + 3SO₂ + 2H⁺ → 3SO₄²⁻ + 2Cr³⁺ + H₂O	[Back to Questions]



15.	Cu + SO₄²⁻ + 4H⁺ → Cu²⁺ + SO₂ + 2H₂O	[Back to Questions]



16.	5H₂C₂O₄ + 2MnO₄⁻ + 6H⁺ → 10CO₂ + 2Mn²⁺ + 8H₂O	[Back to Questions]



17.	5SO₃²⁻ + 2MnO₄⁻ + 6H⁺ → 5SO₄²⁻ + 2Mn²⁺ + 3H₂O	[Back to Questions]



18.	3As₂O₃ + 4NO₃⁻ + 4H⁺ + 7H₂O → 6H₃AsO₄ + 4NO	[Back to Questions]



19.	3CH₃CH₂OH + 2CrO₃ + 6H⁺ → 3CH₃CHO + 2Cr³⁺ + 6H₂O	[Back to Questions]



20.	S₂O₃²⁻ + 4Cl₂ + 5H₂O → 2SO₄²⁻ + 8Cl⁻ + 10H⁺	[Back to Questions]

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