Common ion effect Class 11 Notes | EduRev

Chemistry for JEE

Class 11 : Common ion effect Class 11 Notes | EduRev

The document Common ion effect Class 11 Notes | EduRev is a part of the Class 11 Course Chemistry for JEE.
All you need of Class 11 at this link: Class 11

Common Ion Effect

If to an ionic equilibrium, AB

Common ion effect Class 11 Notes | EduRev
A+ + B‾ , a salt containing a common ion is added, the equilibrium shifts in the backward direction. This is called common Ion effect.

Acetic acid being a weak acid, ionizes to a small extent as:

CH3COOH 
Common ion effect Class 11 Notes | EduRev
CH3COO‾ + H+

To this solution , suppose the salt of this weak acid with a strong base is added. It ionizes almost completely in the solution as follows and provides the common acetate ions:

CH3COONa ————> CH3COO‾ + Na+

the concentration of CH3COO‾  ions increases and by Le Chatelier’s principle, the dissociation equilibrium shift backwards i.e. dissociation of acetic acid is further suppressed.

2) To the solution of the weak base , NH4OH , NH4Cl is added which provides the common NH4ions ,dissociation of NH4OH is suppressed:

NH4OH Common ion effect Class 11 Notes | EduRevNH4+ +OH‾

NH4Cl ———->NH4+Cl‾

3) To the solution of silver chloride in water, if NaCl is added which provide the common Cl‾ ions, the solubility AgCl decreases :

AgCl Common ion effect Class 11 Notes | EduRevAg+ + Cl‾

NaCl ——–> Na+ + Cl‾

Increase in the concentration of Cl‾ ions shifts the equilibrium in the backward direction i.e. some solid AgCl separates out.

If to the solution of a weak electrolyte, which ionises to a small extent ,a strong electrolyte having a common ion is added which ionizes almost completely, the ionization of the weak electrolyte is further suppressed .

If to the solution of a sparingly soluble salt, if a soluble salt having a common ion is added ,the solubility of the sparingly soluble salt further decreases.

Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Related Searches

ppt

,

Common ion effect Class 11 Notes | EduRev

,

Important questions

,

study material

,

Extra Questions

,

Exam

,

Common ion effect Class 11 Notes | EduRev

,

Common ion effect Class 11 Notes | EduRev

,

Free

,

Viva Questions

,

Sample Paper

,

Previous Year Questions with Solutions

,

video lectures

,

past year papers

,

pdf

,

Semester Notes

,

mock tests for examination

,

practice quizzes

,

MCQs

,

Objective type Questions

,

shortcuts and tricks

,

Summary

;