Question

why fumes of sulpher di oxide does not change color of dry litmus paper​

Answer 1

Answer:

Burning sulphur produces a gas which is sulphur dioxide gas. It is confirmed by following experiments.

1) This gas has no effect on dry litmus paper.

2) On a moist litmus paper this gas converts blue litmus to red litmus paper as sulphur dioxide gas formed is acidic in nature and on reacting with moist paper it forms sulphurous acid.

S(s)+O

2

(g)→SO

2

(g)

Explanation:

hope this helps you...

Answer 2

$\huge \red {\boxed{\pink {\underline {\tt {\red{A} {\pink{N} {\color{navy}{S}} {\purple{W} {\orange{E} {\color{blue}{R}}}}}}}}}}$

There will be no change in either of the litmus papers, i.e. dry blue litmus paper will remain blue, and red will remain red.

This is because the reaction is essentially an ionic reaction whereby the chromophores (the conjugate acid/base) of the litmus complex react with hydrogen ions. The dry sulfur dioxide doesn't furnish H+ ions (as it is not in solution, neither it gets to dissolve in a wet litmus paper). It requires aqueous medium to ionize.

I hope it helps!