25 may 2010 - 3 METHODS OF PREPARING SALTS

current being : ( FYE stress ) 

 Here is something to help:


1. PRECIPITATION method ( INSOLUBLE )

• place a known volume of one salt solution in a beaker
• Add solution of the other salt until no longer dissolve
• (i.) filter the mixtures                                                                                                                 
• (ii.) residue is insoluble salt
• (iii.) throw away filtrate containing soluble salt
• wash residue with distilled water
• dry the salt crystal

2. TITRATION method ( SOLUBLE )

• place a known volume of acid in a conical flask; add indicator 
• add alkali from a burette until indicator changes color. (neutralisation complete)
• record volume of alkali used
• repeat again:place same volume of acid in a beaker but do not add indicator
• add same volume of alkali as before to produce salt solution
• heat salt solution to evaporate some water
• (i) allow to cool                                                                                                                            
• (ii) salts crystal form
• filter off salts crystal and dry

3. FILTRATION method ( SOLUBLE )

• Heat some acid in a beaker 
• add metal or metal oxide or carbonate until some no longer dissolves
• a) filter mixture and
• b) throw away residue 
• c) filtrate is a salt solution
• heat filtrate to evaporate some water
• (i) allow to cool
• (ii) salt crystal is form
• filter off salts and dry

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