Question

When sulphuric acid is added to 1gm solid sodium chloride taken in a test tube which gas released ?wt changes do you observe when you test the gas with dry and wet litmus paper ?what is your inference from this experiment. Un

Answer 1

Answer: We infer that the released gas is acidic in nature and is identified when a wet blue litmus paper is brought near the test tube.

Explanation:

When sulfuric acid is reacted with sodium chloride, it leads to the formation of sodium sulfate and also releases hydrogen chloride gas. The gas evolved is acidic in nature.

The chemical equation for the sulfuric acid is reacted with sodium chloride follows:

$H_2SO_4+2NaCl\rightarrow Na_2SO_4+2HCl$

There are 2 types of litmus paper:

• Red litmus paper: This paper will turn blue if it is dipped in basic solution and it remains as such if it is dipped in acidic solution.
• Blue litmus paper: This paper will turn red if it is dipped in acidic solution and remains as such if it is dipped in basic solution.

When dry blue litmus paper is brought near the test tube evolving hydrogen chloride gas, no change is seen because the hydrogen ions present in the gas do not interact with dry litmus paper.

But, when wet blue litmus paper is brought near the surface of test tube, the hydrogen ions interact with the water present in litmus paper leading to the formation of hydrogen ions and turning blue litmus red.

Hence, we infer that the released gas is acidic in nature and is identified when a wet blue litmus paper is brought near the test tube.

Answer 2

Explanation:

when sulpuric acid is added to solid sodium chloride. Hcl gas released this gas does not change the colour of dry litmus papervhowever it changes but blue litmus paper to read this indicates .that gas is acidic in nature