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Question

Two test tubes containing water are labelled A and B. Few drops of hydrochloric acid are added to test tube A and acetic acid to test tube B. Which of the following statements are true regarding the number of H+ ions in the test tubes?

A
Test tube A has more number of H+ ions than test tube B
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B
Test tube B has more number of H+ ions than test tube A
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C
Both the test tubes have equal number of H+ ions
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D
It cannot be predicted
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Solution

The correct option is A Test tube A has more number of H+ ions than test tube B
Acetic acid (CH3COOH) is a weak acid and gets partially ionised in water. This means that not all molecules of acetic acid ionise to form CH3COO and H+ ions.

CH3COOH(aq) H+(aq)+CH3COO(aq)

Hydrogen chloride (HCl) is a strong acid. It ionises completely in water into H+ and Cl ions.

HCl(aq)dissociate−−−−−H+(aq)+Cl(aq)

Therefore, hydrochloric acid will have more number of H+ ions in aqueous solution than acetic acid.

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