Chapter 17, Problem 81A

Interpretation Introduction

Interpretation:

The reason for the different colors of the equilibrium system needs to be explained.

Concept introduction:

Le Chatelier principle states that a system at equilibrium when subjected to changes in the system adjusts it self to attain the equilibrium state again.

Answer to Problem 81A

In the above equilibrium system the different colours are observed due to varying levels of NO₂ in the system. The above reaction is exothermic, therefore at higher temperature the levels of NO₂ increase and the reddish brown color deepens.

Explanation of Solution

Since the dimer cleavage of nitrogen dioxide is an endothermic reaction, on heating the system the equilibrium shifts to the right, increasing the amount of NO₂ gas and darkening the reddish brown color.

Conclusion

The different colors observed in the above system are due to varying levels of NO₂ gas.