Disodium hydrogen phosphate, dodecahydrate is one of the sodium salts of phosphoric acid. CAS 10039-32-4 EC 231-448-7| Chemical Reagents net

It is a common laboratory reagent utilized primarily as a buffer and complexing agent in biochemical experiments. It finds application in various industrial processes including water treatment and metal cleaning.

General Information

Compound Name: Sodium Phosphate Dibasic Dodecahydrate
CAS Number: 10039-32-4
Molecular Weight: 358.14
Molecular Formula: Na2HPO4·12H2O
MDL Number: MFCD00149181
EC Number: 231-448-7

Brand: KeXue (Science Experiment)
Packaging: 500g × 20 bottles/case

Physical Properties

Appearance: White crystals
Density: 1.52 g/cm³
Melting Point: 35 °C (decomposes)
Solubility: Soluble in water, slightly soluble in ethanol

Chemical Properties

pH (1% solution): Approximately 9.0
Stability: Stable, decomposes upon heating to form pyrophosphates

Na+        O
  \      //
   P-O-H2O
  //     \
Na+       O

Quality inspection report

| Item                      | Standard Requirement | Test Result |
|---------------------------|----------------------|-------------|
| Name                      | Sodium hydrogen phosphate dodecahydrate |
| Molecular Formula         | Na2HPO4·12H2O        |
| Molecular Weight          | 358.14               |
| Batch Number              | 2024020101           |
| Batch Size                | 2000 kg              |
| Sending Inspection Unit   | Production Division 1 |
| Sample Category           | Inorganic            |
| Report Date               | 2024.02.03           |
| Testing Standard          | GB/T1263-2006        |
| **Analysis Items**        | **Standard Requirement** | **Test Result** |
| Content, %                | ≥99.0                | 99.8        |
| Appearance                | Colorless crystals   | Colorless crystals |
| pH (50g/L, 25℃)           | 9.1-9.4              | 9.2         |
| Clarity Test              | Pass                 | Pass        |
| Insoluble Matter, %       | ≤0.005               | 0.002       |
| Chloride (Cl), %          | ≤0.001               | <0.001      |
| Sulfate (SO4), %          | ≤0.005               | <0.005      |
| Total Nitrogen (N), %     | ≤0.002               | <0.002      |
| Potassium (K), %          | ≤0.01                | 0.004       |
| Iron (Fe), %              | ≤0.0005              | <0.0005     |
| Arsenic (As), %           | ≤0.0005              | <0.0005     |
| Heavy Metals (as Pb), %   | ≤0.0005              | <0.0005     |
| **Analysis Conclusion**   | Complies with GB/T1263-2006 Analytical Pure requirements. |

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