Order of disolving chemicals to make sodium ascorbate

Discussion in 'Darkroom Developing and Printing' started by CWal871581, Jan 11, 2004.

  1. CWal871581

    CWal871581 Guest

    When making sodium ascorbate from sodium bicarbonate and ascorbic acid does the
    order of putting the chemicals into solution matter?

    FWIW, the 12-30-2001 post that mentions making 1L of a 10% solution transposed
    the amounts listed for bicarbonate (should be 42.4g) and ascorbic acid (should
    be 88.9g) (it's a good thing I'm in the habit of double checking other peoples'
    math).

    TIA,
    Curtis
     
    CWal871581, Jan 11, 2004
    #1
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  2. CWal871581

    nicholas t Guest

    FYI do you realise that it's entirely possible to make the Rodinal
    Vitamin C additive more easily by using Ascorbic Acid and Sodium Carbonate?
    Otherwise, if you are making something else search Photo.net for answers...
     
    nicholas t, Jan 11, 2004
    #2
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  3. If you are just mixing the vit c and the bicarb in distilled water with
    nothing else present at that time, then order does not matter... But if
    anything else is already present then you want the alkali already in
    solution to set the pH before adding the vitamin C powder so that sodium
    ascorbate is formed preferentially ...
    I make my ascorbate developers using this order:
    caustic hydroxide (Red Devil Lye) --> borax (20 Mule Team) --> vitamin C
    (ascorbate source) --> Phenidone/Metol (developing agent) ...

    ya, ya, ya, I know, not the same as you are doing, but the end result is
    the same - sodium ascorbate - and I have a buffered solution for maintaining
    pH during development... There's more than one way to skin an orange..


    Denny
     
    Dennis O'Connor, Jan 12, 2004
    #3
  4. CWal871581

    Dan Quinn Guest

    RE: (CWal871581) wrote
    I've no idea what you've in mind for that ascorbate. By all accounts
    the form which will last is the acid. Vit. C soaks up oxygen like no
    other darkroom chemical of which I'm aware. Not a single suggestion
    has been made for preserving it in solutions even if a little acid.
    As the last post suggested, there is no need for the ascorbate form.
    Photo. Formulary does'nt even handle it. Acid they've got. Dan

    PS: I just thought of oxalic acid and the oxalates. They are, I'd
    say, more or less easily oxidised; about the same league as Vit. C.
     
    Dan Quinn, Jan 18, 2004
    #4
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