Question

auto - catalysis with example

Answer 1

Answer:

In autocatalysis, the reaction is catalysed by one of its products. One of the simplest examples of this is in the oxidation of a solution of ethanedioic acid (oxalic acid) by an acidified solution of potassium manganate(VII) (potassium permanganate).

The reaction is very slow at room temperature. It is used as a titration to find the concentration of potassium manganate(VII) solution and is usually carried out at a temperature of about 60°C. Even so, it is quite slow to start with.

The reaction is catalysed by manganese(II) ions. There obviously aren't any of those present before the reaction starts, and so it starts off extremely slowly at room temperature. However, if you look at the equation, you will find manganese(II) ions amongst the products. More and more catalyst is produced as the reaction proceeds and so the reaction speeds up.

You can measure this effect by plotting the concentration of one of the reactants as time goes on. You get a graph quite unlike the normal rate curve for a reaction.

Answer 2

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$\small\underline\mathcal\pink{{Auto\:Catalysis:-}}$ The catalysis reaction in which,catalyst itself is one of the products of the reaction is called autocatalysis . (or)

when the same enzyme is used as catalyst for the activation of its proenzyme, the phenomenon is called autocatalysis.

Ex :- pepsin , Trypsin

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