Discussion
Sodium phosphate is used as an internal conditioner because it precipitates calcium as a
Answer: C
Correct answer: soft sludge
Sodium phosphate precipitates calcium as calcium phosphate, which forms in the bulk of the water as a loose non-adherent sludge rather than crystallising on the hot metal. The sludge is removed by blowdown. This is the point of the treatment: it does not stop calcium precipitating but changes the form in which it does so.
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