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A student adds a spoon full of powdered sodium hydrogen carbonate to a flask containing ethanoic acid. List two main observations, he must note in his note book, about the reaction chat takes place. Also write chemical equation for the reaction.

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(i) A colourless and odourless gas is evolved accompanied by brisk effervescence.
(ii) When the gas is bubbled through lime water, it becomes milky. For chemical equations, consult chapter 4 (section 4.17).
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