What process is primarily utilized for softening water in oxidation-reduction reactions?

The primary process utilized for softening water in oxidation-reduction reactions is the chemical addition of lime. This method involves the introduction of calcium hydroxide (lime) into the water, which reacts with the hardness-causing components, typically calcium and magnesium ions. Through this chemical reaction, insoluble precipitates are formed, which can then be removed from the water, effectively softening it.

In the context of oxidation-reduction reactions, the chemical addition of lime plays a crucial role not only in removing hardness but also in influencing the overall chemical composition of the water. This process can lead to the precipitation of various compounds, facilitating other subsequent reactions that may occur during water treatment.

Other methods such as filtration, mechanical mixing, and heating do not specifically target the removal of hardness through chemical reactions. Filtration typically removes particles or sediment from water but does not soften it. Mechanical mixing may assist in the distribution of chemicals but does not inherently cause softening. Heating can affect solubility and reaction rates but does not serve as a direct softening agent. Thus, the chemical addition of lime effectively represents the most relevant process for softening water through oxidation-reduction reactions.