For sodium dodecyl sulfate (SDS), It is well known that increasing unbound sodium ions will decrease its CMC of SDS. How about increasing hydrogen and chloride ions? i.e. if anionic surfactant dissolves in water when pH is below 7. Can anyone suggest some sources so I can gather some information? Thank you.
generally cmc of ionic surfactants is lowered when concentration of dissolved ions is increase. In case degree of dissociation is sensitive to pH a shift towards the undissociated form has a more pronounced effect of lowering the cmc.
It could be helpful to have a look at this paper I have co-authored in 1998:
https://www.researchgate.net/publication/244381496_Effect_of_a_Weak_Electrolyte_on_the_Critical_Micellar_Concentration_of_Sodium_Dodecyl_Sulfate?ev=prf_pub.
Please send me a request if you need the full article.
Article Effect of a Weak Electrolyte on the Critical Micellar Concen...
Thank you guys!
Raffaele Ragone: I just have your paper. Thanks!
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