Discussion
A sequestering agent works by
Answer: D
Correct answer: forming a soluble complex with the hardness ions
A sequestrant such as EDTA or a polyphosphate chelates calcium and magnesium into a stable soluble complex, so the ions remain in the water but are no longer available to react with soap, dye or the fibre. Nothing is removed and nothing precipitates, which is what distinguishes sequestering from the lime soda and ion exchange routes.
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