Phosphotungstic Acid

**Definition:** Tungsten hydroxide oxide phosphate. A white or slightly yellowish-green, slightly efflorescent crystal or crystalline powder. It is used as a reagent for alkaloids and many other nitrogen bases, for phenols, albumin, peptone, amino acids, uric acid, urea, blood, and carbohydrates. (From Merck Index, 11th ed)

**Tree numbers:** - D01.029.260.700.675.750 - D01.695.625.675.750 - D01.940.700