laboratory preparation of so2

By treating sodium sulphite or bisulphite with dilute sulphuric acid or hydrochloric acid - The apparatus is set up as shown in figure 7.1. Sodium sulphite or bisulphite is taken in a round bottom flask. Dilute sulphuric or hydrochloric acid is added through the dropping funnel ..

* Sulphur dioxide was known from ancient times and Romans used it as a general cleansing agent. * In 1770 , J.Priestly prepared the gas by the action of hot conc. Sulphuric acid on mercury and called it sulphurous aci..

By direct burning of sulphur in air or oxygen Sulphur + Oxygen Sulphur dioxide ..

1. By direct burning of sulphur in air or oxygen Sulphur + Oxygen Sulphur dioxide 2. By heating certain metallic sulphides in air or oxygen 3. By the action of heat on sulphite..

Discovery of Sulphur Dioxide - Sulphur dioxide has been known to people for ages. Sulphur used to be burnt to produce sulphur dioxide, which was then used as a fungicide and insecticide. Priestley prepared sulphurh..

Sulphur dioxide has been known to people for ages. Sulphur used to be burnt to produce sulphur dioxide, which was then used as a fungicide and insecticide. Priestley prepared sulphur dioxide in the year 1774 by heating ..

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Dry sulphur dioxide does not have any bleaching action. However, if the gas is moist, or if the object to be bleached is moist, then bleaching takes place. Usually only delicate articles such as coloured flowers, silk, wool etc., are bleached by sulphur dioxide..

Before catalytic oxidation of sulphur dioxide, impurities like dust, arsenic etc. have to be removed otherwise they spoil the catalys..

Bleaching Action of Sulphur Dioxide - Dry sulphur dioxide does not have any bleaching action. However, if the gas is moist, or if the object to be bleached is moist, then bleaching takes place. Usually only delicate articles such as coloured flowers, silk, wo..