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

2, what is hydrogen?

what is hydrogen?

Detemine energy of atomic orbitals, Energy of atomic orbitals in a particul...

Energy of atomic orbitals in a particular shell is in the order: (1) s (2) s> p > d > f        (3) p (4)  f > d > s >p Ans:  s

Inorganic chemistry, Metal ion configurations in high and low spin octahedr...

Metal ion configurations in high and low spin octahedral complexes(with)table

Photon absorption for ir spectroscopy, Photon absorption for IR spectroscop...

Photon absorption for IR spectroscopy Absorption spectroscopy refers to spectroscopic methods which measure the absorption of radiation, as a function of frequency or waveleng

You, one two three four get on the dance floor..

one two three four get on the dance floor..

Name the oxide minerals, Q. Name the Oxide Minerals? These minerals con...

Q. Name the Oxide Minerals? These minerals consist of oxides of metals, which are formed either by oxidation of sulphide minerals or by direct oxidation of metals. Highly elect

Explain anhydrous alci is used as a catalyst., (i) Assign appropriate reaso...

(i) Assign appropriate reason for each of observations: (a) Anhydrous ALCI is used as a catalyst. (b) Phosphinic acid behaves as a monoprotic acid. (c) SF6 is not easily h

Cycloalkane, formation of propane by parkin reaction

formation of propane by parkin reaction

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