Water Quality Analyst Complete Practice Test 2025

Question: 1 / 400

What type of precipitate is caused by chlorination in water treatment?

Calcium precipitate

Iron precipitate

Chlorination in water treatment primarily causes the formation of iron precipitates. When chlorine is added to water containing iron, it can oxidize ferrous iron (Fe²⁺) to ferric iron (Fe³⁺). The ferric ions can then combine with hydroxide ions (OH⁻) in the water to form ferric hydroxide, which is poorly soluble and precipitates out of the solution. This process is important for removing iron from water, as it helps improve the quality of the treated water by reducing discoloration and the potential for metallic taste.

The other types of precipitates mentioned—calcium, magnesium, and sodium—are typically associated with different chemical interactions or processes. For instance, calcium and magnesium usually form precipitates in the context of hardness treatment or when interacting with carbonates or sulfates. Sodium does not generally form a precipitate under chlorination conditions, as it remains soluble in water.

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Magnesium precipitate

Sodium precipitate

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