Question

(vii) The reaction between acetic acid and sodium carbonate is shown in the following figure. Answer the questions with the help of diagram.
(a) Which gas does come out as
effervescence in the big test tube?
(b) What is the colour change in the
lime water present in the small
test tube ?
(c) Write the related reaction.
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Answer 1

1. "Carbon Dioxide"

Carbon Dioxide is the gas produced with brisk effervescence.

2. The limewater test (CaO, lime, dissolved in water) is a classical testfor the presence of carbon dioxide. The carbon dioxide gas as it is bubbled through the limewater will react and form insoluble calcium carbonate and water. Hence the milky white color of the floating precipitate

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