BUFFER SOLUTION

Defination :

            Buffer is a solution that resist change in ph when small amount of acid or base is added  to it .

Types of buffer:-

It is of 2 type .

1.Acidic buffer 

2.Basic buffer

Acidic buffer:

Defination :It is a type of buffer whose Ph is less then 7.

Composition :It is type of buffer which is formed by mixing  week acid and its salt with strong base.

Example: Its example is acetic acid sodium acetate buffer.

Basic buffer:

Defination : It is a type of buffer whose Ph is less then 7.

Composition :It is a type of buffer which is formed by mixing week base and its salt with strong acid.

Example :Its example is ammonium hydroxide , ammonium chloride buffer NH4OH &NH4Cl .

Buffer action:

Buffer action mean how do buffer work .

Addition of acid .

When small amount of strong acid like HCl  is added . It ionize to form hydrogen ion and chloride ion .This Hydrogen ion react with acetate ion and forms acetic acid.

HCl → H+ + Cl-

CH3COO- + H+→ CH3COOH 

Since  H+ ions are consumed Hence Ph does not change .

Addition of base 

When strong base like NaOH is added to buffer solution.It ionize as 

NaOH→ Na+  + OH-

Since OH- ions are consumed by H+ of Acetic acid .Hence Ph does not change 

CH3COOH→ CH3COO- + H+ 

OH- + H+ → H2O

Applications of buffer:-

Industrial application:-

Buffer solution is used in industries like leather and dyes industries.

Analytical application:- 

It is used in electroplating and analytical procedure

Calibration of ph meter:-

It is used to check either ph meter is giving correct reading or not.

Biological application:-

Ph of culture medium is maintained by using buffer solution.Change in ph may harm microorganism.

This vedio will be helpfull in understanding the most important topic buffer solution.

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