According to Patrick Gainer: "Ascorbic acid [4 grams] is easily converted to sodium ascorbate by either 1 gram of baking soda or 4.5 ml of 10% sodium hydroxide. If you use the baking soda, add it to the ascorbic acid in a little water and let the fizzing subside before adding it to the working solution."(posted 8179 days ago)This information is in my article Appreciating Rodinal.