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

General , Match the compounds below with the type of bonding each predomina...

Match the compounds below with the type of bonding each predominately exhibit. Question 3 options: NaCO3 NaBr SOCl2 CH4 1. ionic bonding 2. covalent bonding

Write essay 5 pages to 6 pages, Hello Dear, my assignment is that I have to...

Hello Dear, my assignment is that I have to write ESSAY 5 pages to 6 pages in Biochemistry calss about technique. after you read the chapter ( the Chapter as attachment) you figure

Simple and mixed amines - nitrogen containing compounds, Simple and Mixed A...

Simple and Mixed Amines Secondary and tertiary amines may be categorized as simple or mixed amines as per to all the alkyl or aryl groups attached to the nitrogen atom are simi

Explain cmr spectrum, Explain CMR spectrum 2,2-Dimethyl-1-propanamine (...

Explain CMR spectrum 2,2-Dimethyl-1-propanamine (neopentylamine, (CH 3 ) 3 CCH 2 NH 2 ) has a maximum of three resonances in its CMR spectrum.  2-Methyl-2-butanamine, CH 3 CH 2

Electromeric effect - organic chemistry, Electromeric effect (1) The oc...

Electromeric effect (1) The occurrence of movement of electrons from one atom to other in multi bonded atoms at the demand of attacking reagent is known as electromeric effect.

Oxoacids of boron and borates, Orthoboric acid H 3 BO 3 commonly known as ...

Orthoboric acid H 3 BO 3 commonly known as boricacid and Meta boric acid HB0 3 , are two well-known and important oxoacids of boron. On a large scale, H 3 BO 3 is prepared by the

Explain the un-ionized form of vanillin, Explain the un-ionized form of van...

Explain the un-ionized form of vanillin It is the un-ionized form of vanillin that has the typical odor.  In NaOH solution, the phenol group ofvanillin ionizes to its conjugate

Symbols, a dot placed inside a lamp symbol shows

a dot placed inside a lamp symbol shows

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