What is the oxidation state assigned to Mn in potassium permanganate, KMnO4? (Recall that answers must be numbers, that is, F is -1 not 1- in HF.)
Answer:
CHEM1003 Lecture 30: Lecture 30: Oxidation and Reduction IV
Lecture 30
Monday, 23 May 2016
3:49 pm
Oxidation and Reduction (4)
Redox Reactions in Acidic and Basic Conditions:
• In many redox reactions in aqueous solutions, H3O+ or OH- ions play an
important role
• E.g. in the reaction of K3Cr2O7 with FeSO4 the acidity of the mixture decreases
o This is because the reaction uses up H3O+ as a reactant and produces H2O
o
Balancing Redox Equations in Acidic Solutions:
• Identify reactants and products for each half reaction
• Balance atoms other than H and O
• Balance oxygen by adding H2O
• Balance hydrogen by adding H+
• Balance net charge by adding e-
• Make e- gain equal e- loss
Example:
• Half reactions
o
• Balance reduction half
o
• Balance oxygen by adding H2O
• Balance hydrogen by adding H+
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