why ph is between 0 to 14
Answer Posted / sp goswami
The pH concept was introduced in 1909 by the Danish chemist
S.P.L.Sorenson
pH is defined by the negative logarithm of the hydrogen ion
activity:
where aH = activity of the hydrogen ion
The pH scale derives from the characteristics of the auto-
dissociation of Water. Pure water has a low conductivity
and is only slightly ionised however does Water dissociate
slightly into Hydronium ions and hydroxide ions:
or
The concentration of H+ and OH- ions, which are equal, are
1x 10-7 ions per litre The equilibrium constant (or ion
product ) for the dissociation of water, Kw, is
by taking logs of both side we get:
Using the standard abbreviation p for {-log10} we get:
This equation sets the pH scale to 0-14, which gives a
convenient way to express 14 orders of magnitude of [H+].
Any solution with pH>7 contains excess hydroxyl ions and is
alkaline those with pH<7 are acidic, containing excess
hydrogen ions. Regards
Is This Answer Correct ? | 3 Yes | 2 No |
Post New Answer View All Answers
In HPLC (Waters) software Empower1,2 &3 what is the updation for each version
What is gelatinization?
why require to do water content for drug product?
Explain the relations between number of carbon atoms in alkanes and retention time ?
In GC calibration,what is the procedure to calibrate the TCD (thermal counductivity detector)suggest ?
how to decide for one product require water content or LOD?
iam usig ph buffers merk. manually how to prepare ?
how the compound separate in coulunm,explain
Please tell me about the pH of Polycaboxylic ether is it in the 5-6 range ever or more than 6
What is related substance by HPLC impurity limits as per USP?
in hplc chromatogram started from left to right and in uv spectrum started from left to right
What is importance of pH in the Heavy metal test and How it effect on the test results?
what are the guidelines for analytical method validations?
give clarity of linearity and range in method validation
How to calculation of residual solvent methanol (3000 ppm) standard solution, and how many quantity used of test sample