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Chemical Kinetics

Question

What is the initial rate method for the determination of a reaction rate when more than one reactant is present?

Solution

R_{1} = \frac{dx}{dt} = k {[A_{1}]}^{a} {[B_{1}]}^{b}

...(i)

R_{2} = k [A_{2}]^{a} {[B_{1}]}^{b}

...(ii)

Dividing (ii) by (i), we get

\frac{R_{2}}{R_{1}} = {[\frac{A_{2}}{A_{1}}]}^{a}

From this a can be calculated

R_{3} = k {[A_{1}]}^{a} {[B_{2}]}^{b}

...(iii)

Dividing (iii) by (i)

{(\frac{R_{3}}{R_{1}})}^{1} = {(\frac{B_{2}}{B_{1}})}^{b} T h u s b = 1

From this we can calculate b.