1 | Description | White crystalline powder. | white crystalline powder. |
2 | Solubility | Passes | Soluble in water, insoluble in alcohol. |
3 | Identification (Reaction of sulfates) | Complies | A white precipitate should form. |
4 | Identification (Potassium) | Complies | A white precipitate is form. |
5 | Appearance of solution | Passes | Clear and colourless solution |
6 | pH(5% w/v in water) | 6.5 | 5.5-8.5 |
7 | Acidity & alkalinity | 0.2 mL of 0.01 M hydrochloric acid | NMT 0.5 mL of 0.01 M hydrochloric acid or 0.01 M sodium hydroxide is required to change the colour of the indicator |
8 | Chloride (Cl) | Less than 0.0040% | NMT 0.0040 % |
9 | Heavy metals (as Pb) | Less than 0.0010% | NMT 0.0010 % |
10 | Arsenic (As) | Less than 0.0002% | NMT 0.0002 % |
11 | Calcium (Ca) | Less than 0.0200% | NMT 0.0200 % |
12 | Iron (Fe) | Less than 0.0010% | NMT 0.0010 % |
13 | Mercury(Hg) | Less than 0.0001% | NMT 0.0001 % |
14 | Magnesium (Mg) | Less than 0.0020% | NMT 0.0020 % |
15 | Sodium (Na) | Less than 0.01% | NMT 0.01 % |
16 | Lead (Pb) | Less than 0.0002% | NMT 0.0002 % |
17 | Selenium (Se) | Less than 0.0030% | NMT 0.0030 % |
18 | Loss on drying at 130°C | 0.5% | NMT 1.0 % |
19 | Assay (Alkalimetric) | 99.5% | NLT 99.0 % |
20 | Assay (alkalimetric, calculated on dried substance) | 100.01% | 99.0 - 101.0 % |