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With the help of an example explain what is meant by pseudo first order reaction?

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Pseudo-first order reaction is a reaction where one reactant has a very high concentration and during the course of the reaction, it doesn’t change significantly. The reaction proceeds as a first order reaction in such a case. Take for instance the hydrolysis of ethyl acetate and inversion of cane sugar
Hydrolysis of ethyl acetate:

                CH_{3}COOC_{2}H_{5}\; \; \; \; \; \; +\; \; \; \; \; H_{2}O\; \; \; \; \; \; \; \overset{H^{+}}{\rightarrow}\; \; \; \; \; CH_{3}COOH\; \; \; \; \; \; \; \; +\; \; \; \; \; C_{2}H_{5}OH

t=0           0.01\; mol                           10\; mol                              0\; mol                               0\; mol

t=t             0\; mol                                 9.99 \; mol                         0.01 \; mol                         0.01 \; mol   

\text {Rate of reaction}=k[CH_{3}COOC_{2}H_{5}]

Where, k=k'[H_{2}O]

Inversion of cane sugar:

                      C_{12}H_{22}O_{11}\; \; \; \; \; \; \; +\; \; \; \; \; H_{2}O\; \; \; \; \; \; \overset{H^{+}}{\rightarrow}\; \; \; \; \; \; \; C_{6}H_{12}O_{6}\; \; \; \; \; \; +\; \; \; \; \; \; C_{6}H_{12}O_{6}

\text {Rate of reaction}=k[C_{12}H_{22}O_{11}]

Where, k=k'[H_{2}O]              

 

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