Rodinal (EZ , Gainer Formula) Troubleshooting
I gave making Patrick Gainer's EZ Rodinal a try after reading the forum posts here. It seemed more straightforward than the Anchell and Troop book version.
The EZ Rodinal formula is
To 400 ml water, add: 85 g anhydrous sodium sulfite. 40 g p-aminophenol base. Stir well. Add 13.8 g sodium hydroxide or 19.2 g potassium hydroxide. Add water to make 500 ml.
To a brown bottle with 400ml deionized water I added the sodium sulfite first and the p-aminophenol next, while constantly stirring with a magnetic stirbar. Not much seemed to dissolve even after 30minutes and heating to about 60 degrees. So I put in the KOH and the solution cleared quite a bit. The magnetic stirrer has went for a few hours but the solution was still quite cloudy and a lot of undissolved material is present. I would say about 2-3 tablespoons full of crystals. And it doesn't settle very readily.
Is this normal? I thought that only a few crystals were supposed to remain. Also, does this mean that I should titrate in more base until a tiny amount of precipitate is left? If so, what is the target pH of Rodinal? I would appreciate advice from people who've tried this formula out before.
Last edited by chakra; 06-12-2008 at 09:32 AM. Click to view previous post history.