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Sodium phosphate monobasic anhydrous
Product Description
| Molecular weight |
119.98 |
| Molecular formula |
NaH2PO4 |
| CAS No. |
7558-80-7 |
Quality Control
| Appearance (USP) |
Colorless crystals, or white crystalline powder, slightly deliquescent |
| Appearance (BP) |
White slightly deliquescent crystals or granules |
| Appearance (IP) |
A white powder or colourless crystals |
| Solubility (USP) |
Freely soluble in water, practically insoluble in alcohol |
| Solubility (BP) |
Very soluble in water, very slightly soluble in ethanol (96%) |
| Solubility (IP) |
Very soluble in water, very slightly soluble in ethanol |
| Identification A : Sodium (USP) |
Meets the requirements |
| Identification A (BP) |
10% solution in water is faintly acid |
| Identification A (IP) |
Reactions for phosphates |
| Identification B: Phosphate (USP) |
Meets the requirements |
| Identification B (BP) |
10% solution in water yields the reaction characteristics of phosphates |
| Identification B (IP) |
Reactions for sodium salts |
| Identification C (BP) |
10% solution in water neutralize with 10% w/v solution of potassium hydroxide yields reaction A characteristics of sodium salts |
| Identification D: Loss on drying (BP) |
<= 1.0% (at 130°C to constant weight) |
| pH (5% in water at 25°C) (USP, IP) |
4.1 - 4.5 |
| Clarity and color of solution (BP) |
10% solution in water is clear and colorless |
| Acidity: pH (BP) |
4.2 - 4.5 (mixture of 5 mL of solution S and 5 mL of water) |
| Chloride (USP, IP) |
<= 0.014% |
| Chloride (BP) |
<= 0.02% |
| Sulfates (USP, IP) |
<= 0.15% |
| Sulfate (BP) |
<= 0.03% |
| Iron (BP) |
<= 0.001% |
| Insoluble substances (USP, IP) |
<= 0.2% |
| Arsenic (USP, IP) |
<= 0.0008% |
| Arsenic (BP) |
<= 0.0002% |
| Reducing substances (BP) |
The solution retains a slight red colour |
| Aluminium, Calcium, and related elements (USP, IP) |
The sample solution does not become turbid when rendered slightly alkaline to litmus paper with 6N ammonium hydroxide |
| Heavy metals (IP) |
<= 0.002% |
| Water (K.F.) (USP, IP) |
<= 2.0% |
| Loss on drying (BP) |
<= 1.0% (at 130°C to constant weight) |
| Assay (NaOH T, on anhydrous basis) (USP, IP) |
98.0 - 103.0% |
| Assay (NaOH T, dried substance) (BP) |
98.0 - 100.5% |
Storage and Shelf Life
| Storage Condition |
Store below 30°C away from bright light. |
| Shelf life |
48 months. |
CAS Number :
7558-80-7
Molecular Formula :
NaH₂PO₄
More Information
| Product Name |
Sodium phosphate monobasic anhydrous |
| SKU |
TC459M |
| CAS No |
7558-80-7 |
| EC No. |
231-449-2 |
| Molecular formula |
NaH₂PO₄ |