Action of Heat on SaltsHeating a salt may cause it to decompose. The decomposition may result in (a) a colour change (b) evolution of a gas (c) liberation of water vapour Gases such as carbon dioxide, sulphur dioxide, nitrogen dioxide, ammonia or oxygen can be evolved. By identifying the gas or gases liberated, it is possible to pinpoint the anion present in the … [Read more...] about Action of Heat on Salts