Chemistry > Surface Chemistry > 12.0 Enzyme as catalysts
Surface Chemistry
1.0 Introduction
2.0 Adsorption
3.0 Factors affecting adsorption of gases by solids
4.0 Adsorption Isotherms
5.0 Applications of Adsorption
6.0 Types of Solutions
7.0 Colloidal System
7.1 Different Colloidal Systems
7.2 Classification of Colloidal System
7.3 Preparation of Colloidal System
7.4 Purification of Colloidal System
7.5 Properties of colloidal system
8.0 Coagulation of colloidal solutions
9.0 Emulsions
10.0 Catalysis
11.0 Zeolites as shape-selective catalysts
12.0 Enzyme as catalysts
12.1 Characteristics of Enzymes
12.2 Mechanism of enzyme catalysis
12.3 Autocatalysis
12.4 Induced catalysis
12.3 Autocatalysis
7.2 Classification of Colloidal System
7.3 Preparation of Colloidal System
7.4 Purification of Colloidal System
7.5 Properties of colloidal system
12.2 Mechanism of enzyme catalysis
12.3 Autocatalysis
12.4 Induced catalysis
During a chemical reaction, if one of the products formed acts as a catalyst, the phenomenon is called autocatalysis.
Question 6. Explain the auto catalysis reaction in titration of oxalic acid with $KMn{O_4}$.
Solution: In the titration of oxalic acid solution with $KMn{O_4}$ solution in presence of dilute ${H_2}S{O_4}$, the colour of $KMn{O_4}$ first fades slowly and then faster due to the formation of $M{n^{2 + }}$ ions which act as autocatalyst.
\[\begin{array}{c}{2KMn{O_4}}& + &{3{H_2}S{O_4}} \end{array}\begin{array}{c}+ &{5{H_2}{C_2}{O_4}}& \to \end{array}\begin{array}{c}{{K_2}S{O_4}}& + &{2MnS{O_4}} \end{array}\begin{array}{c}+ &{8{H_2}O} \end{array}\begin{array}{c}+ &{10C{O_2}} \end{array}\]
