Disodium monohydrogen phosphate dodecahydrate

B. o-Phthalaldehyde. The a,a,a, a -tetrabromo-0-xylene (344-370 g.) obtained as described above, part A, is placed in a 5-1. round-bottomed flask with 4 1. of 50% (by volume) ethanol and 275 g. of potassium oxalate. The mixture is heated under reflux for 50 hours (a clear yellow solution is formed after 25-30 hours). About 1750 ml. of the ethanol is then removed by distillation (which is stopped before the product begins to steam-distil), and 700 g. of disodium monohydrogen phosphate dodecahydrate (Na2HP04-12H20) is added to the aqueous residue. The mixture is steam-distilled rapidly (Note 4), using an efficient condenser, until 10-12 1. of distillate is collected and the distillate no longer gives a black color test for o-phthalaldehyde 8 when a portion is treated with concentrated ammonium hydroxide fol-... 

Disodium 1,2 ethanedithiol, 39, 23 Disodium monohydrogen phosphate dodecahydrate, 34, 83, 37, 74 Distillation, steam, of p dithiane,... 

Synonyms Dibasic sodium phosphate dodecahydrate Disodium hydrogen phosphate dodecahydrate Disodium orthophosphate dodecahydrate Disodium phosphate dodecahydrate DSP-12 Sodium monohydrogen phosphate dodecahydrate (2 1 1 12) s-Sodium phosphate dodecahydrate... 

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