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

Which elements is a covalently bonded crystal, Name the Which is a covalent...

Name the Which is a covalently bonded crystal? germanium

Borazine, short note on borazine

short note on borazine

13mg of Mg in 4.2mL of HCl, How long would it take to consume 13mg of Mg in...

How long would it take to consume 13mg of Mg in 4.2mL of 1.25M HCl?

Solve, the nitride ion in lithium nitride is composed of 7 protons + 10 ele...

the nitride ion in lithium nitride is composed of 7 protons + 10 electrons. how?

Electrochemistry, sketch of a polarographic current potential curve

sketch of a polarographic current potential curve

The outlet temperature, You are interested in modelling a 10 m  surge tank ...

You are interested in modelling a 10 m  surge tank which holds the products exiting a plug flow reactor, as shown below. One of the purposes of the tank is to heat the reactor prod

The quantum numbers for the outermost electron of an element, The quantum n...

The quantum numbers for the outermost electron of an element are given below as n= 1, l=0, m=0, s = 1/2  . The atoms is: (1) Lithium (2) Beryllium (3) Hydrogen     (4)

Atomic structure and chemical bonding, Ask question #MinimName two compound...

Ask question #MinimName two compound that are covalent when taken pure but produce ions when dissolved in water. um00 words accepted#

How to determine wavelength of electromagnetic waves, Q. How to determine w...

Q. How to determine wavelength of electromagnetic waves? The frequency as well as velocity of a wave determines its wavelength the distance between equivalent points on a con

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