| Ammonium chloride | Same as for chlorides in
| | ammonia.
| |
Pyrogallic acid | Powdered glass | Left behind on solution.
| |
Potassium iodide | Potassium bromide | The crystals of bromide are
| | usually more transparent than
| | those of iodide, but no reliance
| | can be placed on this.
| |
Silver nitrate | Potassium nitrate, | Will not yield the full quantity
| sometimes present | of chloride on precipitation
| in the fused | with HCl. Gives a purple color to
| sticks--not in | flame.
| the crystals |
| |
Sulphuric acid | When vended as pure,| No easy test can be given, as the
| it invariably | substances are so numerous some of
| contains a trace of | them volatile, and most require
| iron. Common acid is| separation from the acid before
| also liable to | detection.
| contain arsenic, |
| selenium, thalium, |
| and many other |
| substances. |
| |
| Organic matter, as | Gives a brown color to the acid.
| a piece of straw |
| in a carboy of acid |
| |