Question

Dilute acetic acid was added to to the four test tubes containing the following chemicals
1.KOh
2. NaHCO3
3. K2CO3
4. NaCl
brisk effervescence was observed in which two test tubes!? Please someone answer fast

Answer 1

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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Answer 2

IT WILL BE FOUND IN TEST 2 AND 3 BECAUSE OF THEY HAVE CARBON PRESENT IN THEM, SO THEY WILL FORM CARBON DIOXIDE AFTER REACTION AND PRODUCE BRISK EFFERVESCENCE WILL BE OBSERVED