Two acids 'A' and 'B' were kept in beakers. Acid 'A' undergoes partial dissociation in water, whereas acid 'B' undergoes complete dissociation in water.
i) of the two acids 'A' and 'B'. Which is weak acid and which is strong acid ?
ii) Give one example for weak acid and strong acid.

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Solution

i) The acid which completely dissociates in water will be strong acid and the acid which is partially dissociated in water will be weak acid.
Weak acid - A, Strong acid - B
ii) Weak acids - $C H_{3} C O O H$ (Acetic acid), $H C O O H$ (Formic acid) citric Acid, Malic Acid, Tartaric Acid.
Strong acids - $H C l$ (Hydro chloric acid), $H N O_{3}$ (Nitric Acid)
$H_{2} S O_{4}$ (Sulphuric Acid ), $H_{3} P O_{4}$ (Phospharic acid)

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C H_{3} C O O N a + H_{2} O \to C H_{3} C O O H + N a^{+} + O H^{-}

H_{2} C O_{3}

H C l

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