In the context of softening, floc is often composed mainly of which precipitate?

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Multiple Choice

In the context of softening, floc is often composed mainly of which precipitate?

Explanation:
In lime softening, adding lime raises the pH and causes magnesium to precipitate as magnesium hydroxide. This Mg(OH)2 forms a gelatinous, fluffy floc that captures other particles and settles out, making it the main component of the floc. Silica tends to stay dissolved or needs different treatment to remove; calcium carbonate does precipitate during softening but the dominant, fluffy mass that composes the floc is Mg(OH)2. Aluminum hydroxide isn’t produced by lime softening itself (it comes from using aluminum-based coagulants), so it isn’t the main floc precipitate here.

In lime softening, adding lime raises the pH and causes magnesium to precipitate as magnesium hydroxide. This Mg(OH)2 forms a gelatinous, fluffy floc that captures other particles and settles out, making it the main component of the floc. Silica tends to stay dissolved or needs different treatment to remove; calcium carbonate does precipitate during softening but the dominant, fluffy mass that composes the floc is Mg(OH)2. Aluminum hydroxide isn’t produced by lime softening itself (it comes from using aluminum-based coagulants), so it isn’t the main floc precipitate here.

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