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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts2 Marks
Question
Why do HCl, HNO3, etc. show acidic characters in aqueous solutions while solutions while solutions of compounds like alcohol and glucose do not show acidic character?
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Answer

HCl and HNO3 etc. dissociate in presence of water to form hydrogen ions (H+). These hydrogen ions combine with H2O to form hydronium ions (H3O+).

The reaction can be given as follows:

$\text{HCl}\xrightarrow{\ \ \ \ \ \ }\text{H}^+\ +\ \text{Cl}^-$

$\text{H}^+\ +\ \text{H}_2\text{O}\xrightarrow{\ \ \ \ \ \ }\text{H}_3\text{O}^+$

Because of this property HCl and HNO3 show acidic character in aqueous solutions. On the other hand, alcohol and glucose cannot dissociate in water to form hydrogen ions. Hence, they do not show acidic character.

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