RE: converting anhydrous to mono...?
Loris, I purchase my potassium carb. from the ChemistryStore.com. It arrives as a dry crystalline state and stays that way in the sealed bucket. Actually I never concerned myself about the type of pot. carb. I measure out the pot. carb. and oxalic acid and mix in a 5 gal. plastic pail. Nothing could be easier. I use distilled H2O. I check the pH after everything is mixed. It's a bit of work but not that bad. Just remember Macbeth ~ " Like a hell-broth boil and bubble. Double, double toil and trouble;" Well not so much trouble just a little work. Don -----Original Message----- From: Loris Medici [mailto:mail@loris.medici.name] Sent: Wednesday, May 20, 2009 4:08 PM To: alt-photo-process-l@usask.ca Subject: RE: converting anhydrous to mono...? Don, I haven't done it before but it seems like it's the only correct way of doing it if you're using uncertain anhydrous potassium carbonate. OTOH, I don't know if there's a stable crystallized version of potassium carbonate... Regards, Loris. 20 Mayıs 2009, Çarşamba, 10:56 pm tarihinde, Don Bryant yazmış: > Loris and all, > >> > I'd just add potassium carbonate to the oxalic acid solution (mixed at > right concentration beforehand) until it doesn't fizz anymore, then add > minuscule amounts of oxalic acid (patiently) checking the pH of the > solution every time, until you reach the desired pH level. (pH 6?) >> > > That's more or less what I do. It works fine and is inexpensive. > > Don
|