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

Viscosity measurement, what is a Newtonian fluid?what is a non-Newtonian fl...

what is a Newtonian fluid?what is a non-Newtonian fluid?

Determine the electronic configurations, Aufbau principle is obeyed in whic...

Aufbau principle is obeyed in which of the following electronic configurations: (1) 1s 2 2s 2 2p 6                    (2)  1s 2 3p 6 3s 2      (3)  1s 2 3s 2 3p 6

Gels, classification of gels

classification of gels

Phenol or carbolic acid - hydrocarbon, Phenol (Carbolic acid), C 6 H 5 OH o...

Phenol (Carbolic acid), C 6 H 5 OH or Hydroxy benzene It was observed by Runge in the middle oil fraction of coal-tar distillation and termed it 'carbolic acid' (carbo = coal, o

What is tracers?, In the study of mechanisms of various chemical reactions,...

In the study of mechanisms of various chemical reactions, Deuterium and Tritium are used as tracers.

Pauli''s exclusion principle states that, Pauli's exclusion principle state...

Pauli's exclusion principle states that: (1) Two electrons in the same atom can have the same energy (2) Two electrons in the same atom cannot have the same spin (3) The

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