Precipitation can be used in industry for which purpose?

• A. Increasing ion concentration
• B. Removing unwanted ions from solutions
• C. Producing gases
• D. Generating heat

Answer: (B)

Precipitation involves forming an insoluble solid from ions in a solution, which lowers the amount of dissolved ions. In industry, this is used to remove unwanted ions from liquids by adding a reagent that makes the target ions form a solid that can be filtered out. This purifies solutions in processes like water treatment, wastewater cleanup, and chemical manufacturing. It’s about reducing ion concentration, not increasing it, and it doesn’t typically produce gases or generate heat in ordinary use. So the best industrial use is removing unwanted ions from solutions.