Question

State Arrhenius Concept of acids and bases. Giving reason, select a strong acid and a weak base from amongst the following substances: (3 marks)
H2CO3, HNO3, NaOH, NH4OH

Answer 1

$\textbf{\large{Answer -}}$

Those substances which gives ${H}^{+}$ ion in aqueous solution are known as acid.

Example :

$HCl (aq) ==> {H}^{+} (aq) + {Cl}^{-}$

$CH_{3}COOH (aq) ==> CH_{3}{COO}^{-} (aq) + {H}^{+} (aq)$

Those substances which gives ${OH}^{-}$ ion in aqueous solution are known as bases.

Example :

$NaOH (aq) ==> {Na}^{+} (aq) + {OH}^{-} (aq)$

$KOH (aq) ==> {K}^{+} (aq) + {OH}^{-} (aq)$

Strong acid among the following -

$\textbf{HNO_{3}}$
Since it can dissociate it's whole ${H}^{+}$ ion.

Weak Base among the following -

$\textbf{NH_{4}OH}$
Since it doesn't have tendency to dissociate it's ion completely.

Answer 2

Answer:

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