Question

Which of the four test tubes containing the following chemicals shows the brisk
effervesence while dilute acetic acid was added to them ?
(i) KOH (ii) NaHCO3 (iii) K2CO3 (iv) NaCl

Answer 1

Explanation:

Here is your answer:-

Brisk effervescence will be observed in test tubes 2 and 3.

This is because an acid reacts with metal carbonate and metal bicarbonate to evolve Carbon-dioxide gas with brisk effervescence.

The reactions involved are-

Test tube 2:-

CH3COOH (aq) + NaHCO3 (aq) ------->

CH3COONa (aq) H2O + CO2 (g)

Test tube 3 -

2CH3COOH (aq) + K2CO3 -------->

2CH3COOK (aq) + CO2 (g) + H2O

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