Normality and molarity are the terminologies of volumetric analysis used to express the concentration of solution. i) Distinguish between molarity…

Normality and molarity are the terminologies of volumetric analysis used to express the concentration of solution.

i) Distinguish between molarity and normality. 

 ii) Deduce the normality equation \( S_1V_1 = S_2V_2 \). 

iii) Why is this equation not always used to calculate molarity? 

 iv) Your chemistry teacher added 4gm of sodium hydroxide in a bottle containing 20 CC of 2N \( H_2SO_4 \) and he diluted it up to 1 litre by adding water. Then, he gave you a blue and a red litmus paper.

a) Which litmus paper would you used to test the solution and why?  

b) Calculate the normality of the dilute solution. 

   OR 

In a following given reaction:

\( SO_3 + 3H_2S \rightarrow 3H_2O + 4S \)

a) Express the rate of above reaction in term of reactants and products. 

 b) The concentration of \( H_2S \) decreased by $0.06 mol/litre$ in 2 second. 

 i) Calculate the rate of formation of Sulphur.

 ii) Why is rate of formation of water is not equal to the rate of disappearance of \( SO_3 \)? 

iii) Calculate the rate of disappearance of \( SO_3 \)

 c) Draw an energy profile diagram to illustrate the effect of catalyst on the activation energy hence on rate. 

d) Define energy of activation.