Q8 of 34 Page 34

Why do acids not show acidic behaviour in the absence of water?

Acids form hydrogen ions [H+ (aq) ions] in its aqueous solution which are responsible for their acidic characters. In the absence of water, acids do not produce hydrogen ions and hence do not show acidic behavior.


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Compounds such as alcohol and glucose also contain hydrogen but are not categorized as acids. Why? Describe an activity to prove it.

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Why does distilled water not conduct electricity whereas rain water does?

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Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively.

(a) Which solution is (i) neutral (ii) strongly alkaline (iii) strongly acidic (iv) weakly acidic, and (v) weakly alkaline?


(b) Arrange the pH values in the increasing order of hydrogen ion concentration.

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Equal lengths of magnesium ribbons are taken in test-tubes A and B. Hydrochloric acid (HCI) is added to test-tube A while acetic acid (CH3COOH) is added to test-tube B. In which test-tube will the fizzing occur more vigorously and why?