[alt-photo] Re: Zia standard solutions

[Loris Medici]

Molar concentration helps where there's more than one variant of the
compound in the market, for instance, at various hydration states. E.g.
citric acid = anhydrous / monohydrate, trisodium citrate = dihydrate /
pentahydrate, oxalic acid = anhydrous / dihydrate, palladium chloride =
anhydrous / dihydrate and so on... If you know the molarity (instead of w/v
%) of the solution(s) you want to mix, then you can use each and every
variant of the compounds, by making a simple ratio calculation in order to
learn the equivalent weight of the replacement variant. If you don't know
the molarity, you're bound to the "specific" variant the formula calls for,
and sometimes that's really a problem - when you can't find it for
instance...

I do also give workshops Terry, would you like to take few lessons (a
private workshop) from me in this issue? (Explaining the principles to music
publishers and theology PhDs and such...) And that would be with the added
bonus of making visit to our beautiful Istanbul... ;) :P

Regards,
Loris.

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org On Behalf Of
Terry King
Sent: Wednesday, July 21, 2010 2:32 AM
To: alt-photo-process-list at lists.altphotolist.org
Subject: [alt-photo] Re: Zia standard solutions

...

Try explaining to us what advantages ' .7 m '  offers over the equivalent
percentage solution figure, then imagine explaining the same thing, and how
you would measure it, to a workshop containing music publishers and theology
PhDs who have come to make pictures.