Chemicals From Salt
Sodium chloride, the chemical name for salt, is a highly valuable compound. In fact, it has been such a valuable product throughout history that it has been used in place of money! In this title, we will look at the different chemicals produced from the electrolysis of sodium chloride in different forms, the processes of electron transfer involved in electrolysis and the uses of the products that are formed.
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Curriculum and Exam Board Information
- Acids, Bases and Alkalis
- describe how pure salt (sodium chloride) can be obtained from rock salt in industry and in the laboratory
- describe the reactions of carbonates (CaCO3, Na2 CO3) with acid and the thermal composition of carbonates (CaCO3, CuCO3)
- Hydrogen ions H(aq) make solutions acidic and hydroxide ions OH(aq) make solutions alkaline
- In neutralisation reactions, hydrogen ions react with hydroxide ions to produce water
- Insoluble Salts
- Insoluble salts can be made by mixing appropriate solutions of ions so that a precipitate is formed
- Metal oxides and hydroxides are bases
- Precipitation can be used to remove unwanted ions from solutions, for example in treating water for drinking or in treating effluent
- Production of hydrogen, chlorine and sodium hydroxide from salt
- recognise oxides and hydroxides as bases (NaOH, CaO, Ca(OH)2, CuO and describe their reactions with water and with dilute hydrochloric and sulphuric acids as appropriate
- Salt solutions can be crystallised to produce solid salt
- Solid Salt
- Soluble hydroxides are called alkalis
- Soluble Salts
- Soluble salts can be made from acids by reacting them with metals (not all metals are suitable, some are too reactive and others not reactive enough), insoluble bases (the base is added to the acid until no more will react and the excess solid is filtered
- state how rock salt is used in its unpurified form and purified
- 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 and sulphuric acid produces sulphates) and the metal in the base or alkali
- The pH Scale
- The pH scale is a measure of the acidity or alkalinity of a solution
- Uses of sodium chloride, hydrogen and sodium hydroxide
- Uses of sodium chloride, hydrogen, chlorine and sodium hydroxide
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