Discussion
Consider the following statements about peroxide bleaching.
1. The perhydroxyl ion is the active bleaching species.
2. A stabiliser is needed to control the rate of decomposition.
3. Higher pH always gives a better result.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the perhydroxyl ion is the bleaching species, and a stabiliser is needed because peroxide otherwise decomposes faster than it bleaches. Statement 3 is wrong in the way it is put - raising the pH increases the perhydroxyl concentration but also accelerates decomposition, so there is an optimum band around pH 10.5 to 11, above which the peroxide is spent uselessly and the fibre is attacked.
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