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

The de-broglie wavelength associated with material particle, The de-Broglie...

The de-Broglie wavelength associated with a material particle is: (1)  Directly proportional to its energy (2) Directly proportional to momentum (3) Inversely proportiona

Alcoholic acidity, I am trying to calculate alcoholic acidity

I am trying to calculate alcoholic acidity

Purification and characterisation of acetone , What is this characterisatio...

What is this characterisation all about?and how do you do it using DNPH?

Assignment, fatty acid distribution in trihydric alcohol for triacylglycero...

fatty acid distribution in trihydric alcohol for triacylglycerol formation

Find the number of degrees of freedom - single phase system, Find the numbe...

Find the number of degrees of freedom? Consider a single-phase system that is a gaseous mixture of N 2 , H 2 , and NH 3 . For each of the following cases, find the number of de

Titration curves, Typical conductometric titration curve for a weak aci and...

Typical conductometric titration curve for a weak aci and a strong base

S block elements, what are the characteristics of s block elements?

what are the characteristics of s block elements?

Sequence of amino acids histidine-glutamine-lysine in buffer, In lab, you'r...

In lab, you're having fun along with buffers based onto a 0.1 M solution of sodium phosphate at pH7.0.  Into this system, there are three of pK A s as:  12.7, 7.21 and 2.12.

Stability of gem diols lies, Stability of gem diols lies on the following f...

Stability of gem diols lies on the following factors: (a) Steric hindrance by +I group around α-carbon decreases the stability of gem diols. +I group decreases stability of gem

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