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Symbol/formula: KClO3
Potassium chlorate.
Symbol/formula: Sb
A lustrous gray metalloid, it is found in nature mainly as the sulphide mineral stibnite. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name 'kohl'.
Symbol/formula: H2SO3
A mineral acid composed of the elements sulphur, oxygen, and hydrogen. It is a colourless, odourless, and viscous liquid that is miscible with water.
A chloride of antimony. Antimony trichloride (SbCl3) is a soft colorless solid with a pungent odour and was known to alchemists as butter of antimony.
Symbol/formula: KNO3
Potassium nitrate. The mineral form is saltpetre, which was useful as a fertiliser and for making gunpowder.
Symbol/formula: HNO2
A weak and monoprotic acid known only in solution, in the gas phase and in the form of nitrite salts.