Question
Explain the following reaction with an example.
Esterification
Esterification
✓
Answer
Substances having ester as the functional group are formed by a reaction between a carboxylic acid and an alcohol. This reaction is known as esterification.
E.g. When ethanoic acid is heated with ethanol in a water bath in the presence of an acid catalyst (concentrated sulphuric acid), ethyl ethanoate and water are formed.
E.g. When ethanoic acid is heated with ethanol in a water bath in the presence of an acid catalyst (concentrated sulphuric acid), ethyl ethanoate and water are formed.
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(Practice Activity Sheer -2 )
→The iron rust is formed due to reaction. Different regions on iron surface become anode and cathode.
Reaction on anode region:
$
Fe _{( s )} \rightarrow Fe ^{2+}( aq )+2 e ^{-}
$
Reaction on cathode region:
$
O _{2( g )}+4 H ^{+}( aq )+\ldots \ldots . .2 H _2 O _{( l )}
$
when $Fe ^{2+}$ ions migrate from anode region they react with.......to fomm $Fe ^{3+}$ ions.
A reddish coloured hytirated oxide is formed from. ions. It is called rust.
$
2 Fe ^{3+}( aq )+4 H _2 O _{( l )} \rightarrow+\ldots \ldots \ldots+6 H ^{+}( aq )
$
A way to prevent rusting..........
(Practice Activity Sheer -2 )