| Description |
A fine, heavy, white powder, free from gritty particles; odourless.
|
Solubility |
Very slightly soluble in acids and in solution of alkali hydroxides, practically insoluble in water and in organic solvents
|
| Identification |
-
|
Identification 'A' |
It should gives the reactions of sulphates
|
| Identification 'B' |
A white precipitate should formed which should be insoluble in dilute sodium hydroxide solution
|
Acidity or alkalinity |
Not more than 0.5 ml of either 0.01M hydrochloric acid or 0.01 M sodium hydroxide should be required to change the colour of the solution
|
| Phosphate |
No yellow precipitate should formed
|
Sulphide |
The paper should not darken
|
| Acid soluble substances |
NMT 0.3%
|
Soluble barium salts |
No turbidity should be produced
|