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Caustic soda is used to separate a mixtu...

Caustic soda is used to separate a mixture of ferric chloride and aluminium chloride. Explain. 

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Both ferric chloride and aluminium chloride react with caustic soda to give the respective metal hydroxides.`FCl_(3)+3NaOHrarr Fe(OH)_(3)+2NaCl`
`AlCl_(3)+3NaOHrarr Al(OH)_(3)+3NaCl`
`Fe(OH)_(3)` is basic, but `Al(OH)_(3)` is amphoteric. `Al(OH)_(3)` is soluble in excess caustic soda to give sodium meta aluminate.
`Al(OH)_(3)+NaOH rarr Na[Al(OH)_(4)]`
`Fe(OH)_(3)` is insoluble and is separated by filtration.
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