Question

How would you obtain:

(a) A base from other base

(b) An alkali from a base

(c) Salt from another salt?

Answer 1

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How would you obtain:

(a) A base from other base

(b) An alkali from a base

(c) Salt from another salt?

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(a) We can obtain a base from another base by double decomposition. The aqueous solution of salts with base precipitates the respective metallic hydroxide.  

FeCl3 + 3NaOH → Fe(OH)3 + 3NaCl

(b) An alkali from a base

Na2CO3 + Ca(OH)2 →Δ2NaOH + 2CaCO3

(c) Salt from another salt

NH4Cl + NaOH → NaCl + H2O + NH3

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