Re: pKa of SDS

Article View: sci.chem

Article #2260

#2260

From: Dr John Christie
Date: Wed, 01 May 1996 00:00

21 lines
1371 bytes

In article <317D4F7B.6834@mmad1.pmmp.uic.edu>, woods@mmad1.pmmp.uic.edu wrote:

< So you guys think BOTH pka's of SDS are less than zero?  I think not!

SDS  -  sodium dodecyl sulfate  - strictly contains **NO** acidic protons,
and so cannot have a pKa.

C12H25OSO3- Na+

Its conjugate acid - dodecylsulfuric acid - is a strong acid which
dissociates completely in water, so pKa is not a useful concept, but its
**ONE** pKa is clearly less than zero.

C12H25OSO3H

The reference to **BOTH** pKa s can only be referring to some other
substance, or based on a complete misunderstanding of the structure of the
material.

John

Technical Details

Message-ID: <chejrc-0105961136160001@131.172.50.82>

Path: arc1-ca.pugleaf.net!unknown!not-for-mail

References:

<4l4jit$5m5@agate.berkeley.edu> <31761B45.31DF@mmad1.pmmp.uic.edu> <3176A622.5424@bbsrc.ac.uk> <317D4F7B.6834@mmad1.pmmp.uic.edu>

Show Full Headers

Complete Article Headers

X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: fd9c4,6e4096e26c4855be
X-Google-Attributes: gidfd9c4,public
X-Google-Thread: f4886,6e4096e26c4855be
X-Google-Attributes: gidf4886,public
X-Google-Thread: 105a11,6e4096e26c4855be
X-Google-Attributes: gid105a11,public
From: chejrc@lure.latrobe.edu.au (Dr John Christie)
Subject: Re: pKa of SDS
Date: 1996/05/01
Message-ID: <chejrc-0105961136160001@131.172.50.82>
X-Deja-AN: 152322624
references: <4l4jit$5m5@agate.berkeley.edu> <31761B45.31DF@mmad1.pmmp.uic.edu> <3176A622.5424@bbsrc.ac.uk> <317D4F7B.6834@mmad1.pmmp.uic.edu>
organization: School of Chemistry, La Trobe University
newsgroups: sci.chem,bionet.molbio.methds-reagnts,bionet.molbio.proteins

Reply to Parent Message