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

All the bonds pcl5 are not equivalent, Give chemical reaction in support of...

Give chemical reaction in support of each of the following statements: (i) The +1 oxidation state gets stabilised progressively from Ga to TI in Group (ii) All the bonds PCl5

What is piezoelectricity, What is piezoelectricity Piezoelectricity pr...

What is piezoelectricity Piezoelectricity provides us a means of converting electrical energy to presume new geometric positions and mechanical dimensions of the substance are

S Block, What are the physical propeties of S block ?

What are the physical propeties of S block ?

Spectroscopy, list down example of spectroscopic methods based on interacti...

list down example of spectroscopic methods based on interaction of matter electromagnetic radiation?

Dual nature of particles was proposed, Dual nature of particles was propose...

Dual nature of particles was proposed by: (1) Heisenberg (2) Lowry (3) de-Broglie     (4) Schrodinger Ans:de-Broglie

Explain about frequency of electromagnetic waves, Q. Explain about frequenc...

Q. Explain about frequency of Electromagnetic waves? Electromagnetic waves all along with water waves and sound waves exhibit certain common characteristics. All waves consist

Standard calomel electrode, explain the merits and demerits of calomel ele...

explain the merits and demerits of calomel electrode

The number of electrons in, The number of electrons in [ 40 19 k ] -1   i...

The number of electrons in [ 40 19 k ] -1   is: (1) 19      (2) 20      (3)18     (4)40 Ans: 40

Methane - members of alkanes, Methane - Members of Alkanes It is also t...

Methane - Members of Alkanes It is also termed as marsh gas.   (i) Industrial method of preparation: Mathane gas is acquired on a large scale from natural gas by liquefactio

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