3. Salt formation

Available for over a year

In this episode, Dr Sunayana Bhargava and Tulela Pea explore chemical reactions that form salts and how they are named. Suitable for: AQA, Edexcel, OCR. For more information on salt formation, check out the BBC Bitesize website: https://www.bbc.co.uk/bitesize/guides/ztv2dxs/revision/4 Key learning objectives discussed in this episode include: - Acids react with some metals to produce salts and hydrogen. (For metal + acid reactions, knowledge of reactions is limited to those of magnesium, zinc and iron with hydrochloric and sulfuric acids.) - Acids are neutralised by alkalis (eg soluble metal hydroxides) and bases (eg insoluble metal hydroxides and metal oxides) to produce salts and water, and by metal carbonates to produce salts, water and carbon dioxide. - The particular salt produced in any reaction between an acid and a base or alkali depends on:the acid used (hydrochloric acid produces chlorides, nitric acid produces nitrates, sulfuric acid produces sulfates), the positive ions in the base, alkali or carbonate. - Soluble salts can be made from acids by reacting them with solid insoluble substances, such as metals, metal oxides, hydroxides or carbonates. The solid is added to the acid until no more reacts and the excess solid is filtered off to produce a solution of the salt. - Salt solutions can be crystallised to produce solid salts. - Students should be able to describe how to make pure, dry samples of named soluble salts from information provided.