Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 400 off


Plz explain hard and soft acids and bases.

7 years ago


Answers : (1)


The Lewis defination recognizes acids and bases in terms of their ability to accept or donate electron pairs. as such the strength of any acid or base is determined by the very nature of the reation involved in any particular electron transfer process. Accordingly, assignment of any single consistent crirerion for aid base strength becomes very difficult in th eLewis defination. Attempts have been made to correlate various factors from enthaly changes for acid base combinations.

The criterion of hardness (or softness) is ascribed to the "hardness" of the electron cloud associated with any species. A firmly held electron-cloud with low polarizability makes a species "hard", while an easily polarizable electron cloud characterizes the species as "soft". A third category with intermediate character appears in the border line.

The principal distinguishing features of hard and soft acid and bases may then be summarized as follows:

Hard acids

Soft acids

(i)                 Small size

(i)                 Large size

(ii)               High positive oxidation state, absence of any outer electron which are easily excited to higher states.

(iii)             Zero or low positive oxidation state, several easily excitable valence electrons.


7 years ago

Post Your Answer

Other Related Questions on Organic Chemistry

Nylon 6 is which polymer condensation or addition ? Plz provide reference
Hi ! Praful , NYLON-6 is a condensation type of polymer.Nylon-6 is other wise known as polycaprolactum.These fibre are wrinkleproof, highly resistance to abbrasion such as chemicals like...
nath 2 months ago
With very tough, high strength and tensile nylon – 6 is not a condensation polymer but a semicrystalline polyamide. It somewhat resembles the characterstics of Nylon – 6,6.
Vikas TU 2 months ago
How is pressure inversly proprtion to volume in mole concept??
For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle's law is a gas law , stating that the pressure and volume of a gas...
Umakant biswal 3 months ago
According to Boyle's law or Pressure-Volume Law which state that the volume of a given amount amount gas held at constant temperature varies inversely with the applied pressure when the...
somprasad 3 months ago
In bond enthalpy it is the amount of energy required to break one mole of bond? How can there be one mole!! Bond
@ mayank yes , 1 mole of bond is possible . 1 mole besically specifies to 6.022 * 10 ^ -28 ( avogadro no . ) no ofparticles. so, if that much no of particles will going to be combine then...
Umakant biswal 2 months ago
Sir please tell me that what is henry`s rule nd how can I use it numerical question ?????????That`s I can get a secure answer???????And what is the value of Henry`s constant????
."water takes up, of gas condensed by one, two, or more additional atmospheres, a quantity which, ordinarily compressed, would be equal to twice, thrice, &c. the volume absorbed under the...
rahul kushwaha 27 days ago
@ rahul At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium...
Umakant biswal 27 days ago
Calculate relative rate of effusion of O2 to CH4 through a container containing O2 and CH4 in 3:2 mass ratio
Rate of O2= > R1 = (3x/32)A/root(32T) Rate of CH4 = > R2 = (x/8)A/root(16T) Divide both eqns. we get, R1/R2 = ¾ * root(16/32) = > 3/4root2 is the respective rate of effusion ratio.
Vikas TU one month ago
Why Hydrogen Sulphide precipitates Zinc Chloride in neutral medium & not in acidic medium.
@ gagandeep kindly see the below reaction zncl2 + hc = 2hcl + zns then its a double displacement reaction . as its a double displacement reaction , it cannot have suitable condition in...
Umakant biswal 2 months ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,000 off

Get extra R 400 off

More Questions On Organic Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details