Iron(iii)chloride is acidic while sodium carbonate is basic. Explain.

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Solution

The salts of strong acid and weak base give acidic solutions and the salts of strong base and weak acid give alkaline solutions.
Iron(III) chloride is acidic because it is formed by the reaction of a weak base Fe(OH)₃ and a strong acid HCl. Thus FeCl₃ is acidic in nature.

3 HCl + Fe(OH)₃ $\to$ FeCl₃+ 3 H₂O
hydrochloric Iron Iron water
acid hydroxide Chloride

Sodium carbonate (Na₂CO₃) solution is made up by the reaction of a strong base NaOH and weak acid carbonic acid(H₂CO₃₎ thus aqueous solution of Sodium carbonate is alkaline .
H₂CO₃+ 2NaOH $\to$ Na₂CO₃+ 2 H₂O
carbonic sodium sodium water
acid hydroxide carbonate

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