Potassium Bitartrate

Potassium Bitartrate, dried at 105 for 3 hours, contains not less than 99.0 percent and not more than 101.0 percent of C4H5KO6. Ignite it: it leaves a residue that imparts a reddish purple color to a non-luminous flame. A saturated solution of Potassium Bitartrate yields a yellowish orange precipitate with sodium cobalt nitrite TS. A solution (1 in 10 of Potassium Bitartrate) responds to the tests for Tartrate.