Home » Ask & Discuss » Chemistry. » Physical Chemistry « Back to Discussion

Physical Chemistry

New kid on the Block

Joined:	23 Jul 2011
Post:	9

2 Feb 2012 07:21:15 IST

0 People liked this

170

pH of an electrolyte

Chemistry

Many books define pH as "Negative log of concentration of free H+ ions or H30+ ions in a solution." My ques. is in what way d con. is expressed? I mean, is it in terms of 'N' or 'M'? If 'N' why not 'M'? d symbol [ ] denotes no. of moles, right? (Law of mass action: active mass∝molarity) I found it is N in many books (by observing problems). What is the reason?

Share this article on:

Comments (2)

Ajith Rao

New kid on the Block

Joined: 23 Jul 2011

Posts: 9

2 Feb 2012 07:51:36 IST

Like 0 people liked this

To make my question more precise, my doubt was in case of strong electrolytes.

Arjun Virmani

Forum Expert

Joined: 1 Jun 2009

Posts: 1294

3 Feb 2012 23:52:37 IST

Like 0 people liked this

pH is for conc. of H+ ions and for it the normality is equal to molarity.

as the Normality for H+ is equal to 1 Eq/L as its charge is +1 only..

N = charge * M............. !!!

so in this case it is same!!

REMEMBER i am saying about H+ ion conc. not the source or acid from where it is derived!!

for H+ ion M = N..............!!!!

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team