Tests

         (i) When heated strongly, tartaric acid chars readily giving a smell of burnt sugar to produce free carbon and pyruvic acid.

         (ii) With AgNO₃ : A neutral solution of tartaric acid gives a white ppt. which is soluble in ammonia. A silver mirror is obtained on warming the ammonical silver nitrate solution (Tollen's reagent).

         (iii) With Fenton's reagent : (H₂O₂ containing a little of ferrous salt) and caustic soda, It gives a violet colour.

         (iv) With Resorcinol and conc. H₂SO₄ : It gives blue colour. 

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