Answer
Verified
398.4k+ views
Hint: Any system at equilibrium when subjected to a disturbance like change in concentration, pressure or temperature responses in a way that tends to cancel or minimize the effect of that disturbance.
Complete answer:
Le Chatelier, a French chemist in 1884 proposed that the effect of change in temperature, pressure and concentration on a system in equilibrium can be studied. Le Chatelier’s principle states that if a reaction at equilibrium is subjected to change in parameters like temperature, pressure or concentration of reactants and products, then the reaction equilibrium shifts in a direction in which the change is counteracted upon.
Let us apply the Le Chatelier’s principle on the following equilibrium and discuss the effect of temperature, pressure and concentration on it one by one:
Effect of Temperature: Since the enthalpy of formation ($\Delta H$) of $S{{O}_{3}}$ is negative, the given equilibrium reaction is exothermic. If the temperature of the reaction is increased, then the reaction will proceed in the direction where the heat is absorbed, i.e. in the backward direction. Whereas, if the temperature is lowered, the equilibrium shifts in the forward direction where the heat is evolved. Therefore, being exothermic in nature, this reaction is favoured by low temperature. An optimum temperature of 673-723 K is used for the formation of $S{{O}_{3}}$ in the Contact process.
Effect of pressure: The given reaction proceeds forward with decrease in number of moles. If the pressure is increased, then as per Le Chatelier’s, the equilibrium is shifted in the direction in which the pressure decreases and hence, the number of moles also decreases, i.e. in the forward direction. Therefore, increase in pressure favours the formation of $S{{O}_{3}}$.
Effect of Concentration: If the concentrations of reactants $S{{O}_{2}}$ and ${{O}_{2}}$ are increased, then according to Le Chatelier’s principle, the reaction equilibrium shifts in the direction where the reactants are consumed, i.e. in the forward direction. Therefore, increase in concentration of $S{{O}_{2}}$ and \[{{O}_{2}}\] leads to higher concentration of $S{{O}_{3}}$.
Note: The reactions (in gaseous phase) where the number of moles of product is equal to the number of moles of reactants, equilibrium is independent of the pressure. Addition of a catalyst does not alter the position of equilibrium of a reaction.
Complete answer:
Le Chatelier, a French chemist in 1884 proposed that the effect of change in temperature, pressure and concentration on a system in equilibrium can be studied. Le Chatelier’s principle states that if a reaction at equilibrium is subjected to change in parameters like temperature, pressure or concentration of reactants and products, then the reaction equilibrium shifts in a direction in which the change is counteracted upon.
Let us apply the Le Chatelier’s principle on the following equilibrium and discuss the effect of temperature, pressure and concentration on it one by one:
\[2S{{O}_{2}}_{_{(g)}}+{{O}_{2}}_{_{(g)}}\rightleftarrows 2S{{O}_{3}}_{_{(g)}};\Delta H=-189kJ\]
Effect of Temperature: Since the enthalpy of formation ($\Delta H$) of $S{{O}_{3}}$ is negative, the given equilibrium reaction is exothermic. If the temperature of the reaction is increased, then the reaction will proceed in the direction where the heat is absorbed, i.e. in the backward direction. Whereas, if the temperature is lowered, the equilibrium shifts in the forward direction where the heat is evolved. Therefore, being exothermic in nature, this reaction is favoured by low temperature. An optimum temperature of 673-723 K is used for the formation of $S{{O}_{3}}$ in the Contact process.
Effect of pressure: The given reaction proceeds forward with decrease in number of moles. If the pressure is increased, then as per Le Chatelier’s, the equilibrium is shifted in the direction in which the pressure decreases and hence, the number of moles also decreases, i.e. in the forward direction. Therefore, increase in pressure favours the formation of $S{{O}_{3}}$.
Effect of Concentration: If the concentrations of reactants $S{{O}_{2}}$ and ${{O}_{2}}$ are increased, then according to Le Chatelier’s principle, the reaction equilibrium shifts in the direction where the reactants are consumed, i.e. in the forward direction. Therefore, increase in concentration of $S{{O}_{2}}$ and \[{{O}_{2}}\] leads to higher concentration of $S{{O}_{3}}$.
Note: The reactions (in gaseous phase) where the number of moles of product is equal to the number of moles of reactants, equilibrium is independent of the pressure. Addition of a catalyst does not alter the position of equilibrium of a reaction.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
How many millions make a billion class 6 maths CBSE
Fill the blanks with proper collective nouns 1 A of class 10 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
What organs are located on the left side of your body class 11 biology CBSE
What is BLO What is the full form of BLO class 8 social science CBSE