Ph scale, Chemistry

Assignment Help:

Being simultaneously basic and acidic, water undergoes autoprotolysis, also called self-ionization:

1192_Untitled.png

The equilibrium constant is

1847_Untitled.png

 

H3O+ in these equations is general simply written H+. In pure water and in solutions that do not give any additional source of H+ or OH- both ions have molar concentrations exact to 10-7. Addition of an acid decreases [OH-] and hence increases [H3O+]; addition of a base has the reverse effect.

 

The pH scale is defined by

 

450_Untitled.png

Neutral water has a pH of 7, acidic solutions have lower values of ph (typically 0-7), and basic solutions or alkaline higher values (7-14). In alkaline or basic solutions [OH-] is thus greater than [H+].

 

Strong and weak behavior

The equilibrium constant of the protolysis reaction

 

451_Untitled.png

is known as the acid dissociation constant (Ka) of HA or the acidity constant:

 

219_Untitled.png

It is often expressed as a pKa value, described as

 

80_Untitled.png


Related Discussions:- Ph scale

Give example of allotropy, Give example of Allotropy The element carbon...

Give example of Allotropy The element carbon has two common allotropes: diamond, where the carbon atoms are bonded together in a  tetrahedral lattice arrangement, and  graphite

Chemistry, when a 0.800g sample of cacl2 is dissolved in 9.85g of water in ...

when a 0.800g sample of cacl2 is dissolved in 9.85g of water in a microscale calorimeter, the temperature of the solution rose from 23.4 to 35.8

Mention the product of onion and garlic, Onion and Garlic Onions (A. c...

Onion and Garlic Onions (A. cepa), and garlic (A. sativam), have been used in traditional and folk medicine for over 4000 years.  Disorders for which both garlic and onions ha

Chemical properties of tri-halides - oxidation , Chemical properties of Tri...

Chemical properties of Tri-halides - Oxidation  Phosgene is very poisonous gas. To use chloroform as an anaesthetic agent, it is required to save the reaction. The specified tw

Miller indices of the diagonal plane of a cube, Miller indices of the diago...

Miller indices of the diagonal plane of a cube are   (110)

Explain ratio scales, Ratio scales It is also possible to record likin...

Ratio scales It is also possible to record liking or acceptability using magnitude estimation scaling methods, but consumers may find it difficult to handle the concept of rat

Thermodynamics, Given that dH for the reaction is -92.2 kJ mol-1, which is ...

Given that dH for the reaction is -92.2 kJ mol-1, which is larger, the total bond dissociation energy of the reactants or the total bond dissociation energy of the products?

Acid halide, what are the chemical propertiies of acid halide?

what are the chemical propertiies of acid halide?

Mole concept, What wieght of CO is required to form re2(CO)10 from 2.5 gm o...

What wieght of CO is required to form re2(CO)10 from 2.5 gm of re2(O)7

Mono carboxylic acid, #question.what is chemical structures and names of fi...

#question.what is chemical structures and names of first 20 mono carboxylic acid? .

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd