Editing Qualitative inorganic analysis (section)

=== 3rd analytical group of anions ===
The ''3rd group of anions'' consist of [[Sulfates|SO{{su|b=4|p=2&minus;}}]], [[Phosphates|PO{{su|b=4|p=3&minus;}}]] and [[Borates|BO{{su|b=3|p=3&minus;}}]]. They react neither with concentrated nor diluted H<sub>2</sub>SO<sub>4</sub>.

* Sulfates give a white precipitate of BaSO<sub>4</sub> with BaCl<sub>2</sub> which is insoluble in any acid or base.
* Phosphates give a yellow crystalline precipitate upon addition of HNO<sub>3</sub> and [[ammonium heptamolybdate|ammonium molybdate]] and heating the solution.
* Borates give a green flame characteristic of [[triethyl borate|ethyl borate]] when ignited with concentrated H<sub>2</sub>SO<sub>4</sub> and ethanol.