BASE HYDROLYSIS AND FACTOR EFFECTING BASE HYDROLYSIS

1. BASE HYDOLYSIS & factor
effecting base hydrolysis

2. CONTENT
1. HYDROLYSIS
2. TYPE OF HYDROLYSIS
3. BASE HYDROLISIS
4. MECHANISM
5. QUTION ASKED IN NET AND GATE etc.
6. Factor effecting

3. HYDROLYSIS
 Addition of water is called hydrolysis or aquation
IN INORGANIC CHEMISTERY
 The substitution reaction in which ligand is replaced
by water molecule are called hydrolysis or aquation
EXAMPLE

4. TYPE OF HYDROLYSIS
 There are two type of hydrolysis
1. Acidic hydrolysis
If the hydrolysis is carried out in acidic pH<3 medium then it is
called acidic hydrolysis. In the reaction ligand replace by H2O
molecule.
2. Base hydrolyis
If the reaction carried in basic medium then it is called base
hydrolysis . in this reaction a ligand is replace by OH- group.

6. TYPE OF MECHANISM IN HYDROLYSIS
 There are two type of mechanism used in base hydrolysis
1. Dissociative reaction mechanism
ML5---X + K1 ML5 +X It proceed first order reaction.
K-1 Rate of reaction depend on
ML5 + Y K2 ML5---Y concentration of one species. SN1CB
2. Associative reaction mechanism
ML5X + Y K1 ML5X---Y second order reaction .
rate of reaction depend on concentration two species.
ML5X---Y K2 ML5Y +X SN2

7. • For base hydrolysis atleast one ligand having acidic proton.
• H2O IS ENTERING GROUP .NOT OH-
• There is movement of ligand.
• In amido complex NH2- is pi donor.
• In absence of pi donor ligand T.B.P is lees stable.
• OH- abstract the H+ from NH3 group which is trans to living
group .
rate=Kb[Co(NH3)5Cl]2+
1.Whate is acid conjugate base.
2.Which is rate determining step.

9. Factor effecting rate hydrolysis
 Chelating and Steric hindrancen increase the rate of
raction
 [Co(en)2LCl]+ +OH- [Co(en)OHCl] + Cl-
 L= CL- ,OH-,NO2-,CN-.
O-
 H2N==Co==N
O-
Cl->CN->NO2- ;e-density provide by NH2- is removed by NO2-due to M—L
pi bonding lability of group decrise

10. Exception
 A = [Co(py)4Cl]- B= [Co(CN)5Cl]-
 trans [Co(tren)(NH3)Cl]2+ cis[Co(tren)(NH3)Cl]2+