LNSTKr.MKNTS AM) ( IIK.MK Al. TI.ST8 . r >,V. 



REAGENTS 



Solid reagents are kept in small salt-mouth bottles from which 

 they an- easily removed in small quantities, with a spatula, as 

 required for use. To insure a clean and pure reagent the 6XC6H 

 should never l>e returned to the bottle. 



Borax glass, fused sodium biborate, Na2B 4 O 7 , in granules, the 

 size of rice grains, and also finely powdered borax for use as a flux. 



Salt of Phosphorus. Sodium ammonium hydrogen phosphate, 

 NaNH 4 HPO 4 . 4 H 2 O. For S. Ph. beads. 



Soda, dry sodium carbonate, Na-jCOs, used as a flux in the decom- 

 position of silicates. Five parts of soda are mixed with one part 

 of finely powdered mineral and a drop or two of water added to 

 form a paste ; this charge is fused on coal or platinum wire until it 

 stops effervescing, when the charge is dissolved in dilute acid. 



Potassium bisulphate. Potassium hydrogen sulphate, KHSO 4 , 

 is used as a component of special fluxes. Upon heating potassium 

 bisulphate loses water, passing over to potassium pyrosulphate, 

 K 2 S 2 O 7 ; with continued heating SO 3 is driven off as white fumes. 

 The residue is normal potassium sulphate, K 2 SO 4 . 



Potassium nitrate, KNO 3 , is used in small quantities as an oxidiz- 

 ing agent. 



Copper oxide, CuO, finely powdered, is used in the dry test 

 for chlorine. 



Test lead, both granular and sheet, free of silver, is used in the 

 cupellation test for silver. 



Tin, granular and sheet, is used in the reduction of salts in solu- 

 tion, also as a reducing agent when fused with the borax, or S. Ph. 

 bead on coal. 



Silver, a bright silver surface, as a coin, is used in the test for 

 sulphur. 



Bone ash. Used in making the cupels in the separation of silver 

 and gold from the lead button. 



Turner's flux. Made by mixing one part of powdered fluor- 

 spar with four parts of potassium bisulphate. Used in the decom- 

 position of boratcs in testing for the boric acid flame. 



Lithium flux. Made by mixing one part of powdered fluor- 

 spar with one and one half parts of potassium bisulphate. Used 

 in the decomposition of silicates in testing for a lithium flame. 



Potassium flux. Made by mixing three parts of powdered 

 calcium carbonate and one of ammonium chloride. Used in 



