Question

What will we observe on adding dilute hydrochloric acid to sodium bicarbonate placed in a test tube

Answer 1

we see that a colorless, odorless gas which turns blue litmus paper red is evolved. The gas turns lime water milky and had no effect on KMnO4 and K2Cr2O7 paper. (CO2 gas is evolved)

Answer 2

Answer: Effervescence due to the release of carbon dioxide gas will be seen.

Explanation:

When dilute hydrochloric acid is added to sodium bicarbonate solution, the products formed are sodium chloride, carbon dioxide gas and water.

The occurrence of reaction can be seen by the release of effervescence at the end of test tube.

The chemical reaction of hydrochloric acid and sodium bicarbonate follows the equation:

$NaHCO_3+HCl\rightarrow NaCl(aq.)+CO_2(g)+H_2O(l)$

Hence, effervescence due to the release of carbon dioxide gas will be seen.