Chemistry
How would you obtain:
(a) a base from another base,
(b) an alkali from a base,
(c) salt from another salt?
Acids Bases Salts
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Answer
(a) A base from another base can obtained by double decomposition. The aqueous solution of salts with base (alkali) precipitates the respective metallic hydroxide.
For example,
FeCl3 + 3NaOH ⟶ 3NaCl + Fe(OH)3 ↓ [red brown ppt.]
(b) An alkali from a base can be obtained by the action of water on soluble metallic oxides like oxides of sodium, potassium and calcium:
CaO + H2O ⟶ Ca(OH)2
(c) A salt from another salt can be obtained by adding an alkali to the solutions of the salts of the heavy metals like copper, iron, zinc, etc.
For example,
FeSO4 [aq.] + 2NaOH [aq.] ⟶ Na2SO4 [aq.] + Fe(OH)2 ↓ [dirty green]
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