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Making Salts Methods

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Introduction

Making Salts ? GCSE Notes Making Soluble Salts To make a soluble salt, an acid is neutralised by adding a metal, a solid base, a solid metal carbonate, or a solution of an alkali. Soluble salts can be made by the process of: * Titration * Excess Reactant Titration Titration methods are carried out for a soluble base (an alkali) reacting with an acid to produce a soluble salt, e.g. reacting sodium hydroxide with hydrochloric acid to make sodium chloride. The problem with the reaction of a soluble base reaction with acid is that once all the acid has reacted, any excess base will not be visible; so there is no signal that all the acid has been neutralised. ...read more.

Middle

The volume of base that is required can be added carefully from the burette to produce a colourless solution, instead of the coloured solutions produced when indicator is added. This clear colourless solution can be heated to encourage crystals to form and then left to cool down slowly so that large crystals can form. Excess Reactant Excess Reactant methods are carried out for a metal or insoluble base reacting with an aid to produce a soluble salt e.g. reacting copper(II) oxide with sulphuric acid to make copper(II) sulphate. The first stage is the addition of the base to the acid. The base is added until no more visible reaction can be seen i.e. the base no longer dissolves, no more effervescence occurs. ...read more.

Conclusion

together. Firstly, a certain amount of lead nitrate, and a certain amount of sodium chloride is poured into a measuring cylinder. The two solutions are tipped into another small beaker and are stirred together. A piece of filter paper is folded into a filter funnel and placed into a conical flask. The contents of the beaker are poured into the conical flask, the soluble sodium nitrate in the filter paper is washed away and the insoluble lead chloride is placed onto a fresh piece of filter paper and left to dry. Direct Combination Direct combination is used when the anhydrous (contains no water) salt is required. The two elements are directly heated together and left to dry. For example to form Iron (III) Sulphide, iron and sulphur are heated together. http://www.chem.umass.edu/~whelan/genchem/whelan/class_images/Solubility_Guidelines.jpg http://image.slidesharecdn.com/saltpreparation-120202043058-phpapp02/95/slide-24-728.jpg?cb=1328180272 ...read more.

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