Redox Reactions in Biological Systems
This page explores redox reactions in biological contexts, focusing on the example of oxalate ions in rhubarb plants.
Redox reactions play crucial roles in many biological processes. The accumulation of oxalate ions in rhubarb plants over the course of a year is an interesting example of how these reactions can impact plant physiology and human consumption.
Vocabulary: Oxalate ions C2O42− are the conjugate base of oxalic acid, a compound found in many plants.
In rhubarb plants, oxalate ion concentration increases throughout the growing season, making the leaves potentially harmful for human consumption by mid-June.
Example: The reaction between oxalate ions and permanganate ions can be used to determine oxalate content in rhubarb leaves:
5C₂O₄²⁻ + 2MnO₄⁻ + 16H⁺ → 10CO₂ + 2Mn²⁺ + 8H₂O
This reaction occurs in acidic conditions, producing carbon dioxide and manganeseII ions.
Highlight: Understanding redox reactions in biological systems is crucial for fields like biochemistry, toxicology, and food science.