Discussion
Sodium chlorite bleaching is carried out under acidic conditions and its main practical difficulty is
Answer: A
Correct answer: the chlorine dioxide it releases
Sodium chlorite works at acid pH and gives an excellent white with very little fibre damage, but it liberates chlorine dioxide, which is toxic, irritant and corrodes ordinary stainless steel. The equipment must therefore be titanium or a specially resistant alloy and the vessels must be extracted, which is what limits its use to fibres such as polyester-cotton and some synthetics where its gentleness is worth the trouble.
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