| Description |
White, granular crystals or a crystalline powder; hygroscopic
|
Solubility |
Very soluble in water, soluble in glycerin; practically insoluble in ethanol (95%)
|
| Identification |
-
|
Identification 'A' |
It should give the reaction of potassium salts
|
| Identification 'B' |
The solution should give reaction of citrates
|
Appearance of solution |
Solution A should clear and colourless
|
| Acidity or alkalinity |
Not more than 0.2 ml of 0.1 M hydrochloric acid or 0.1 M sodium hydroxide should be required to change the colour of the solution
|
Arsenic |
NMT 2 ppm
|
| Oxalate |
NMT 300 ppm (calculated as anhydrous oxalic acid)
|
Sulphates |
NMT 150 ppm
|
| Readily carbonisable substance |
The solution is not more intensely coloured than reference solution YS2 or GYS2
|
Water |
4.0 – 7.0%
|
| Assay (as C6H5K3O7; on anhydrous basis) |
NLT 99.0% and NMT 101.0%
|