What is precipitation reaction Class 10

Precipitation reactions hold an important place in chemical science and are used in many ways.  Today we will learn what is precipitation reaction? In this article, you will be able to know the definition, examples and FAQs etc.

 

Precipitation Reaction definition

A precipitation reaction is a reaction in which soluble ions of separate solutions are mixed together to form an insoluble compound that settles down as a solid. This insoluble compound is called a precipitate.

Precipitate Reaction

What is a precipitate?

A precipitate is an insoluble solid substance which is formed when two solutions are mixed together.

Precipitation Reaction Examples

    

    1.  Barium chloride reacts with sodium sulphate to form barium sulphate and sodium chloride. Barium sulphate is precipitate.

  `BaCl_2  +Na_2SO_4→ BaSO_{4(s)}  + 2NaCl`

   2.  When carbon dioxide is passed in calcium hydroxide, a white precipitate of calcium carbonate is formed.

  `Ca(OH)_2    +CO_2→ CaCO_{3(s)} + H_2O`

   3.  Reaction between silver nitrate and sodium chloride produces a precipitate of silver chloride and sodium nitrate remains as an aqueous solution.

  `AgNO_3  + NaCl  → AgCl_{(s)}  + NaNO_{3(aq)}`

   4.  Solution of lead nitrate and potassium iodide are mixed together, and a precipitate of lead iodide is formed in the reaction.

 

  `Pb(NO_3)_{2 (aq)} + 2KI_{(aq)} → PbI_{2(s)} + 2KNO_{3 (aq)}`

    5.  When calcium chloride and sodium carbonate solutions are mixed with each other, the resulting precipitate of calcium carbonate and sodium chloride remains in the solution.

   `CaCl_{2 (aq)} + Na_2CO_{3 (aq)} → CaCO_{3(s)} + 2NaCl_{(aq)}`

Are all precipitation reactions double displacement reactions?

When two aqueous solutions are mixed together, resulting in the formation of an insoluble solid called a precipitate, these are precipitation reactions and the exchange of ions takes place so also called double displacement reactions.

So, all precipitation reactions are double displacement reactions.

 

Are all double displacement reactions precipitation reactions?

All double displacement reactions do not involve the formation of a precipitate. Some double displacement reactions result in the formation of soluble products which means no precipitate forms, so these double displacement reactions are not called precipitation reactions

 

Related Topics

1. What happens during a chemical reaction

FAQs

 

       

    1.  How  do you identify a precipitation reaction?

Ans. – If an insoluble solid substance is formed during  a chemical reaction, then it must be a precipitation reaction.

 

    2.  What is an ionic precipitation reaction?

Ans. – When a solid precipitate is formed through the exchange of ions between two ionic solutions, the reaction is an ionic precipitation reaction.

   3.  What  are precipitation reactions used for?   

Ans. – Precipitation reactions are used for Qualitative analysis, Water treatment, Synthesis of new compounds, Removal of pollutants, Production of pigments, pharmaceutical purposes etc.

 

   4.  How  do you write a precipitation reaction?

Ans. -   AB + CD  → AD  + CB

       

   5.  Why is the precipitation reaction also called a double displacement reaction?

Ans. – In the double displacement reactions, there is an exchange of ions between two compounds and resulting in the formation of two new compounds.

The same thing happens in the precipitation reactions so they are called double displacement reactions.

 

    6.  When do precipitation reactions occur? 

Ans. – Precipitation reactions occur when two aqueous solutions are mixed together, and ions of both solutions exchange to form a precipitate.

    7.  What causes precipitation reaction?

Ans.- solubility of the compounds and the interaction between ions cause precipitation reactions to occur.

    8.  Is a precipitate soluble?

Ans.- No, a precipitate is not soluble.

    9.  Is a precipitate solid? 

Ans.- Yes, a precipitate is a solid substance.