Which of the following gives the correct increasing order of acidic strength ? [NCERT Exemplar Problems]
(a) Water < Acetic acid < Hydrochloric acid
(b) Water < Hydrochloric acid < Acetic acid
(c) Acetic acid < Water < Hydrochloric acid
(d) Hydrochloric acid < Water < Acetic acid
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Answer:
Water < Acetic acid < Hydrochloric acid
Explanation:
Acidic strength is the ability of acid to loss its H+ ions. Water is neutral and consists of H+ and OH- ions
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(a) Water < acetic acid < hydrochloric acid
Hydrochloric acid is a mineral acid and ionises completely in water, that's why it is a stronger acid. Acetic acid is an organic acid and ionises only partially in water, hence, it is a weak acid. Water has some what neutral nature. Thus, the order of acidity is
water < acetic acid < hydrochloric acid.
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