Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.
| TEST | SPECIFICATION |
| Description | Colourless, crystals or white, crystalline powder, odourless |
| Solubility | Freely soluble in water, practically insoluble in Ethanol |
| Identification | A. Complies with the test for Sodium B. Complies with the test for Chloride |
| Acidity or Alkalinity | Not more than 0.5 ml of 0.01 M NaOH/HCL is required |
| Appearance of solution | The sample of solution (solution S) is clear and colourless |
| Bromide | Notmore than 50 ppm |
| Ferrocyanide | No blue colour is produced within 10 minutes |
| Iodidie | The mixture shows no blue colour after 5 minutes |
| Nitrites | The absorbance is not more than 0.01 at 354nm |
| Sulphate | Not More than 200 ppm |
| Arsenic | Not More than 1 ppm |
| Barium | After 2 hours, any opalescence in the solution is not more intense than that in a mixture of 5 ml of solution S & 7 ml of distilled water |
| Iron | Not more than 2 ppm |
| Phosphates | Not more than 25 ppm |
| Magnesium and alkaline earth metals | Not more than 100 ppm calculates as Ca |
| Heavy Metals | Not more than 5 ppm |
| Loss on drying (at 105⁰ C) | Not more than 0.5% w/w |
| Assay | 99.0% to 100.5% |