Common household bleach is an aqueous solution of 5.25 per cent sodium hypochlorite used for stain removal and sanitation in laundry and cleaning products. Sodium hypochlorite is an oxidiser, and reacts with reducing agents, organic compounds, cleaning products and acids. It can form hazardous products during reactions with certain cleaning agents and acids.
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Bleach is highly reactive and can form toxic gases when combined with other common household cleaners. Bleach and ammonia react to from chloramines, which are nitrogen compounds with one or more attached chlorine atoms. Chloramines evolve as a toxic gas from this reaction because they are less soluble than ammonia. Bleach also reacts with cleaners that contain phosphoric acid or sulphuric acid, such as toilet bowl cleaners and drain cleaners. These reactions release heat and produce highly corrosive compounds.
Acetic acid is an effective reducing agent in oxidation-reduction (redox) reactions with bleach. Redox reactions occur when an oxidising agent, such as bleach, becomes reduced (i.e., its ions lose electrons). Reducing agents, such as acetic acid, become oxidised: their ions gain electrons. The reaction of bleach and acetic acid releases chlorine gas, which can irritate the eyes, nose and throat and cause breathing problems and vomiting. When combined with water, chlorine gas forms hydrochloric and hypochlorous acids.
Bleach releases hypochlorite, which oxidises the organic compounds in fabric dyes and stains. During some of these reactions, the chemical bonds of the organic compounds break and the smaller, water-soluble molecules rinse away, resulting in the removal of stains, and the colour, from dyed fabrics. Organic fibres such as wool and hair are acidic and can be neutralised by bleach. In this type of reaction, the fibres disintegrate as the bleach neutralises the acids. Water and salts are the products of this reaction.
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