Slow and fast rate of Chemical Reaction

RATE OF CHEMICAL REACTIONS


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AVERAGE AND INSTANTANEOUS RATE OF CHEMICAL REACTION



Average rate of chemical reaction

        It may be defined as the change in concentration of a reactant or product of a chemical reaction in a given interval of time. So

the change in concentration of a reactant or product of a chemical reaction in a given interval of time is called as Average rate of chemical reaction

       Let us take an example to understand this. When acidified hydrogen peroxide (H2O2) is added to a solution of potassium iodide (KI) then iodine is liberated.

H2O2 (aq) + 2KI (aq) + H2SO4 (aq) 2H20 (l) + I2 (aq) + K2SO4 (aq)

Here initially the concentration of iodine is zero. But with the passage of time, it increases and the reaction solution becomes brownish. Concentration of iodine can be measured at different intervals of time by titration against sodium thiosulphate.

If concentration of iodine rises from 0 to 10-5 mol L-1 in 10 seconds.

the formula of rate of reaction in terms of the change in concentration of products

Instantaneous rate of reaction

It may be defined as the change in concentration of a reactant or product of a chemical reaction at a given instant. So, we can calculate the instantaneous reaction rate of above reaction at any instant by using the following formula
       Instantaneous reaction rate = the change in concentration of a reactant or product of a chemical reaction at a given instant

Where d[I2] = small change in concentration of iodine

and        dt  = small change in time




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