The ionisation constant of acetic acid is 1.74 x10-5. calculate the degree of dissociation of acetic acid in its 0.05M solution. calculate the concentration of acetate ion in the solution and its pH.

One mole of  and one mole of CO are taken in a 10-litre vessel and heated to 725K. At equilibrium, 40% of water (by mass) reacts with carbon monoxide according to the equation



Calculate the equilibrium constant for the reaction. 

Nitric oxide reacts with Br₂ and gives nitrosyl bromide as per reaction given below:
                                
When 0.087 mol of NO and 0.0437 mol of Br₂ are mixed in a closed container at constant temperature, 0.0518 mol of NOBr is obtained at equilibrium. Calculate equilibrium amount of NO and Br₂.

At 700K, equilibrium constant for the reaction:
     
is 54.8. If 0.5 mole/litre of HI(g) is present at equilibrium at 700K, what are the concentration of H₂(g) and I₂(g) assuming that we initially started with HI(g) and allowed it to reach equilibrium at 700 K?

Ethyl acetate, is formed by the reaction of ethanol and acetic acid and equilibrium is represented as

(i) Write the concentration ratio (reaction quotient), Q_c, for this reaction (note:water is not in excess and is not a solvent in this reaction).
(ii) At 293K, if one starts with 1·00 mol of acetic acid and 0·18 mol of ethanol, there is 0·171 mol of ethyl acetate in the final equilibrium mixture. Calculate the equilibrium constant.
(iii) Starting with 0·5 mole of ethanol and 1·0 mole of acetic acid and maintaining it at 293K, 0·214 mole of ethyl acetate is formed after sometime. Has equilibrium been reached ?

128. The ester, ethyl acetate, is formed by the reaction of ethanal and acetic acid and equilibrium is represented as

(i) Why some concentrated sulphuric acid is usually added to the reaction mixture in a laboratory preparation of ethyl acetate?

(ii) Since the heat of reaction is nearly zero for this reaction, how will the equilibrium constant depend on upon the temperature?