| Description |
White, granular crystals or a crystalline powder; hygroscopic
|
Identification |
-
|
| Identification 'A' |
It gives the reaction of potassium salts
|
Identification 'B' |
The solution gives reaction of citrates
|
| Appearance of solution |
10% solution in water is clear and colourless
|
Acidity or alkalinity |
Not more than 0.2 ml of 0.1M hydrochloric acid or 0.1M sodium hydroxide is required to change the colour of the solution
|
| 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 |
NLT 99.0% and NMT 101.0% of C6H5K3O7, calculated on anhydrous basis
|