pH of hair, skin, and formulations to match

[Guest guest]

Hello:

I'm new to the group, and have a question about target pH of lotions

and hair products.

As I try to learn by analyzing and testing some sample formulations

from various web sites, I have found a number of formulations where

the oil phase has a pH of 5-6. The water phase called for a gram of

Citric Acid (presumably an [anti-]chelating agent], which would have

pushed my pH further down.

I know that skin buffers well, but I found that this mildly acidic

lotion stung slightly on any scratches or cuts.

Can someone tell me what pH I should be aiming for to avoid this

irritation (I presume around 7), or whether there are non-aciding

anti-chelating agents I should instead consider? Also, if neutralizing

is an option, is Baking Soda acceptable, or do I want TEA or another

base (CP soap?) instead?

Thanks much, and Happy New Year,

/m