What is a common observable change when a non-metallic oxide is bubbled through a base?
There is a decrease in alkalinity of the solution
Non-metallic oxides are acidic in nature. When such an oxide (for example CO2 or SO2) is bubbled through a basic solution, it reacts with the base to form a salt and water, neutralising the OH- ions.
As the base is consumed, the pH of the solution moves towards 7 and the alkalinity of the solution decreases. No gas is evolved, the solution does not turn red (that would need an acid-base indicator in the reverse direction), and the reaction is mildly exothermic, not sharply endothermic.
Hence, the answer is There is a decrease in alkalinity of the solution.
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