Name: Preparation of Insoluble Salts
Uploaded: 2019-07-19
Duration: 2 min 50 s
Description: A precipitation reaction is an example of a "Double Displacement Reaction" and is one of the ways to produce insoluble salts. Let us learn about it.

Question

What is the difference between a displacement and a double displacement reaction?

Accepted Answer

Displacement reaction Double displacement reaction

(i) In a displacement reaction, atom or group of atoms present in a molecule is displaced by another atom or group of atoms.

In this reaction, more reactive element displaces a less reactive element from its aqueous solution.

(i) In a double displacement reaction, two compounds exchange their ions in aqueous solutions to form two new compounds.

Displacement reaction Double displacement reaction

(ii) For example, when zinc is added to the copper sulphate solution, zinc displaces copper from copper sulphate solution.

$\underset{Zinc}{Zn (s)} + \underset{Copper sulphate}{{CuSO}_{4} (aq)} \to \underset{Zinc sulphate}{{ZnSO}_{4} (aq)} + \underset{Copper}{Cu (s)}$

(ii) For example, when the aqueous solution of silver nitrate react with the aqueous solution of sodium chloride forms silver chloride and sodium nitrate.

$\underset{Silver nitrate}{{AgNO}_{3} (aq)} + \underset{Sodium chloride}{NaCl (aq)} \to \underset{Silver chloride}{AgCl (s)} + \underset{Sodium nitrate}{{NaNO}_{3} (aq)}$

What is the difference between a displacement and a double displacement reaction?

Important Questions on Chemical Reactions

Learn and Prepare for any exam you want !