Sulphur dioxide (SO2) is a temporary bleaching agent. 2[H] + colouring matter → Colourless matter. Sulphur dioxide removes oxygen from the coloured substance and makes it colourless. Bleaching by sulphur dioxide is temporary as atmospheric oxygen re-oxidizes the bleached matter after some time.
How is SO2 a bleaching agent?
Bleaching property of chlorine is due to oxidation whereas the bleaching property of sulphur dioxide is due to reduction. Chlorine reacts with water and produces nascent oxygen.Sulphur dioxide acts as a temporary bleaching agent and removes oxygen by reduction as mentioned in the above reaction.
Why is sulfur dioxide used as a bleach?
In the presence of water, sulfur dioxide is able to decolorize substances. Specifically, it is a useful reducing bleach for papers and delicate materials such as clothes. This bleaching effect normally does not last very long. Oxygen in the atmosphere reoxidizes the reduced dyes, restoring the color.
How is SO2 a reducing agent?
i) Sulphur dioxide is reducing agent because sulphur has d-orbital so it can easily expand its oxidation state +4 to +6 and thus behave as reducing agent.
Is used as a bleaching agent?
Chlorine dioxide is a neutral chlorine compound which is produced as a gas and it is saturated in water. Chlorine dioxide is about 10 times more soluble in water than hypochlorite. As such, it is widely used as a bleaching agent and is a potent antimicrobial chemistry.
How does the bleaching action of Cl2 differs from SO2?
The key difference between bleaching action of SO2 and Cl2 is that bleaching action of SO2 proceeds through a reduction reaction and is a temporary bleaching process whereas bleaching action of Cl2 proceeds through an oxidation reaction and is a permanent bleaching process.
What is the best bleaching agent?
Hydrogen peroxide is best known for its bleaching reactions at alkaline pH in mechanical and chemical pulp bleaching as well as deinking. Hydrogen peroxide can also be used as a starting chemical for the production of peroxy acids.
What is sulphur dioxide used for?
One of the main uses of sulphur dioxide is as a chemical intermediate in the production of sulphuric acid. It is also used as a fumigant, a food preservative and as a bleaching agent. Sulphur dioxide has also been used in the purification of petroleum products.
What is sulphur used for?
The major derivative of sulphur is sulphuric acid (H2SO4), one of the most important elements used as an industrial raw material. Sulphur is also used in batteries, detergents, fungicides, manufacture of fertilizers, gun power, matches and fireworks.
How does H2O2 act as bleaching agent?
The nascent oxygen combines with colouring matter which in turn gets oxidized. Thus, the bleaching action of hydrogen peroxide is due to the oxidation of colouring matter by nascent oxygen. It is used for the bleaching of silk, ivory, wool or feather.
How does SO2 act as oxidising and reducing agent?
In SO2, sulphur having oxidation state +4 so it can lose its two more electrons to attain+6 oxidation state. Therefore it can lose and gain electron therefore it acts as oxidising as well as reducing agent.
Why are SO2 is strong reducing agent?
In alkaline medium, the above reaction is shifted in forward direction due to the removal of the hydrogen ions , therefore, sulphur dioxide is a more powerful reducing agent in the alkaline medium than in acidic medium.
Is SO2 oxidizing agent or reducing agent?
It is called sulfur dioxide and has a formula $S{{O}_{2}}$. The sulfur dioxide acts as a reducing agent as well as an oxidizing agent.
Which is used as bleaching agent and disinfectant?
Abstract. Sodium hypochlorite (bleach, CAS 7681-52-9) is an aqueous solution produced by the mixture of chloramine gas and water. It is used as a disinfectant in various settings.
Which one of the following is used as a bleach?
Sodium hypochlorite (NaClO), usually as a 3–6% solution in water, usually called “liquid bleach” or just “bleach”.
Which is used as bleaching agent in water treatment?
Disinfectants Sodium hypochlorite. Sodium hypochlorite (NaOCl) is a compound that can be effectively used for water purification. It is used on a large scale for surface purification, bleaching, odor removal and water disinfection.
What is the action of chlorine on SO2?
Chlorine’s bleaching action is based on oxidation, whereas sulphur is based on reduction. Chlorine produces nascent oxygen as it reacts with water. As oxygen reacts with a coloured material, it turns it colourless. Sulphur dioxide depletes the oxygen content of the coloured material, rendering it colourless.
Why is chlorine used for bleaching action?
When chlorine reacts with water, it produces nascent oxygen. This nascent oxygen combines with colored substances present in organic matter, and oxidizes it to colorless substances.Bleaching action of chlorine is permanent because it involves the oxidation process.
Is Cl2 a bleaching agent?
It is a powerful bleaching agent. Bleaching action is due to oxidation. Coloured substance Colourless substance + O → It bleaches organic matter in the presence of moisture. Bleaching effect of chlorine is permanent.
How do celebrities bleach their skin?
How do they do it? Some sources indicate that they use chemical peels, surgery or lasers to whiten their skin. In fact, some strong creams such as Benaquin are used as well as drugs that can inhibit production of melanin.
What are the natural bleaching agents?
Skin Bleaching: DIY Home Remedies To Brighten Your Skin Naturally
- Yogurt. Yogurt (and other milk products) contains lactic acid that helps in lightening skin (4).
- Lemon.
- Milk.
- Tomato.
- Gram Flour.
- Turmeric.
- Sandalwood (Shwet Chandan or White Sandalwood)
- Saffron.
Contents