[pure-silver] Re: DS-14 Concentrate ?'s
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 6 Jan 2005 10:12:20 -0500
Yes, for example, the presence of the sodium sulfite should decrease the total
amount of sodium carbonate which can dissolve. Potassium carbonate is much more
soluble than the sodium salt but also more expensive. Potassium salts are used
when highly concentrated photographic solutions are desired such as Rodinal.
Some concentrated paper developers use a mixture of sodium carbonate and sodium
hydroxide. You would have to experiment to find the right amounts; but the
resulting product really wouldn't be DS-14 any more.
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of Breukel, C. (HKG)
Sent: Thursday, January 06, 2005 9:41 AM
To: 'pure-silver@xxxxxxxxxxxxx'
Subject: [pure-silver] Re: DS-14 Concentrate ?'s
> -----Original Message-----
> From: Koch, Gerald [mailto:gkoch02@xxxxxxxxxx]
> The solubility of sodium carbonate (anhydrous) is about 150
> g/l @ 20 C. The
> solubility of the monohydrate would only be slightly higher.
> Since the formula
> calls for 30 g/l it would therefore be impossible to prepare
> a 8X concentrate of
> this developer.
>
> Jerry
Jerry,
Is this solubility influenced by the other components of the developer ?
(somehow I know I knew once, but my basic chemistry training was 25 years ago,
and I went into molecular biology since..)
Best,
Cor
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