Cation Exchange Reaction

A cation exchange reaction occurs when positively charged ions, known as cations, swap places between two substances. This typically happens in soils, where nutrients like calcium, magnesium, and potassium, which are essential for plants, exchange with hydrogen or aluminum ions in the soil. This process helps maintain soil fertility and ensures plants can absorb necessary nutrients. Cation exchange capacity (CEC) is a measure of how well soil can hold and exchange these nutrients, affecting plant growth and agricultural productivity.