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Question
A student is studying the properties of acetic acid. List two physical properties of acetic acid he observes. What happens when he adds a pinch of sodium hydrogen carbonate to this acid? Write any two observations.
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Solution
Physical properties of acetic acid:
a) It freezes during winters, as its melting point is 290 K.
b) It has a characteristic vinegar-like odour.
When a pinch of sodium hydrogen carbonate is added to acetic acid in a test tube, a brisk effervescence is observed due to evolution of a colourless and odourless carbon dioxide gas, CO2.
Chemical equations for the reaction:
CH3COOH(aq) + NaHCO3(s) → CH3COONa(aq) + H2O(l) + CO2(g)
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