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

Electro dialysis for brackish water, Q.   What are ion selective membranes ...

Q.   What are ion selective membranes used in electro dialysis of brackish water. Give examples. Ans. Electro dialysis for brackish water: The ion selective membranes are use

#thermochemistr, can all the total heat content available betotally convert...

can all the total heat content available betotally converted to work done?

Radioactivity, what is the principal of radiometric titration

what is the principal of radiometric titration

Organic chemistry, what is the structural formula of Hexane-1,6-dioic acid

what is the structural formula of Hexane-1,6-dioic acid

Molecular formula of gaseous hydrocarbons or eudiometry, Molecular formula ...

Molecular formula of gaseous hydrocarbons   (Eudiometry) Eudiometry is a direct method for calculation of molecular formula of gaseous hydrocarbons without ascertaining the pe

Atoms or group of atoms which are electrically, Atoms or group of atoms whi...

Atoms or group of atoms which are electrically charged are known: (1) Anions                                           (2) Cations       (3) Ions (4) Atoms Ans:

Rusting Nails Prac Report, I get stuck on how to explain things.. eg I need...

I get stuck on how to explain things.. eg I need to explain that you coat 5 nails and put one different nail with a different coating into a different substance etc, and i just can

Physical charterstics of monocarboxylic acids, Physical charterstics of mon...

Physical charterstics of monocarboxylic acids            Physical state: The first or initial three members (upto 3 carbon atoms) are colourless, pungent smelling liquids.

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