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

Price ceiling problems, Price ceiling problems: The persistent shortage ...

Price ceiling problems: The persistent shortage created by price ceiling will in turn pose the following problems:  Rationing Government may have to apportion the quantity s

Urea or carbamide - carboxylic acids, Urea or Carbamide  - Carboxylic acid...

Urea or Carbamide  - Carboxylic acids Urea may be referred like a diamide of an unstable and dibasic carbonic acid by which both the hydroxyl groups have been changed by -NH 2

The valence electron in the carbon atom are, The valence electron in the ca...

The valence electron in the carbon atom are: (1) 0        (2) 2          (3) 4       (4) 6 Ans: 4

Schiff''s reaction and tischenko reaction, Schiff's reaction and Tischenko ...

Schiff's reaction and Tischenko reaction (a) Schiff's reaction: this reaction restores pink colour to Schiff's reagent (aqueous solution of p-rosaniline hydrochloride decolouri

What are molecular orbitals, What are molecular orbitals? How are they form...

What are molecular orbitals? How are they formed? What does molecular orbital theory states? what is the significance of molecular orbital theory? Ans) Molecular orbitals are for

No molecule acts as a passitive and negative ligand. why?, Molecule in itse...

Molecule in itself is electrically stable so it cant act as ligand So that it can acts as the negative and pasitive ligand.

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