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

Orbital angular momentum for a d-electron, Orbital angular momentum for a d...

Orbital angular momentum for a d-electron is: (1) 6h/ 2Π             (2) √6/ 2 Π (3) 12 h/ 2Π (4)  √12h/ 2Π Ans:  √6/ 2 Π

Packing of atoms, how can i make an assignment on this topic

how can i make an assignment on this topic

How is harvest maturity identified, How is harvest maturity identified? ...

How is harvest maturity identified? Before harvesting, the first thing to be looked into is the identification of harvest maturity. We have already seen what the term ac

What is a trained sensory panel, Q. What is a trained sensory panel? A ...

Q. What is a trained sensory panel? A sensory panel is the panel of members of which are capable of giving high reliability of judgements, independent of psychological factors

S-block elements, What are the genral properties of s-block elements

What are the genral properties of s-block elements

Compton effect, What are the significance of compton effect

What are the significance of compton effect

Lowest energy to highest, Change the given molecule to a Newman Projection ...

Change the given molecule to a Newman Projection with the C2 carbon at the front and looking down the C2-C3 bonddraw all eclipsed and staggered conformations.  Identify the interac

Analytical chemistry, explain the notion of environmental analytical chemis...

explain the notion of environmental analytical chemistry

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