Double Displacement Reaction

Chemistry

Concept:- Double Displacement Reaction

You, must have known about Displacement reaction uptil now. In displacement reaction, there was a single element displacing another element which was less reactive.

As, the name suggests, in a double displacement reaction, two elements will displace each other simultaneously. That is why the name,"double displacement reaction", as two displacement reactions are taking place simultaneously.

Example-

Na2SO4(aq) + BaCl2(aq) → BaSO4(s)(ppt) + 2NaCl(aq)

In the above reaction, Na and Ba displace each other simultaneously.

Note:-

In the above reaction, BaSO4, one of the product formed is found to be insoluble in water. Any insoluble salt formed is called a precipitate. Hence, the above reaction is also called a precipitation reaction, due to the formation of an Insoluble precipitate.

In the above video, the white cloudy precipitate is Barium Sulphate, which is an insoluble precipitate.

Another precipitation reaction is shown below.

Some more reactions of precipitation reactions are shown below.

The yellow color lead iodide precipitate formed, is also known as golden rain.