Chemistry Practice Problems Redox Reactions Practice Problems Solution: Which substance is the reducing agent in this reac...

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Solution: Which substance is the reducing agent in this reaction?2Cr(OH)3 + 3OCl− + 4OH− → 2CrO4−2 + 3Cl−+ 5H2OExpress your answer as a chemical formula.

Problem

Which substance is the reducing agent in this reaction?

2Cr(OH)+ 3OCl− + 4OH− → 2CrO4−2 + 3Cl+ 5H2O

Express your answer as a chemical formula.

Solution

We’re being asked to identify the reducing agent in the given reaction:

2 Cr(OH)+ 3 OCl– + 4 OH–  2 CrO4–2 + 3 Cl + 5 H2O


To do so, we need to identify the change in oxidation state for each element in the reaction. 

Recall the mnemonic for redox reactions:

Loss Electrons  Oxidation  Reducing Agent

Gain Electrons  Reduction  Oxidizing Agent


This means the element that loses electrons/oxidized is the reducing agent

We’re given the balanced redox reaction so we can ignore the coefficients, OH, and H2O and only focus on Cr(OH)3, OCl, CrO42–, and Cl.


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