Sodium Phosphate Monobasic Dihydrate

• CAS: 13472-35-0
• Catalog Number: ACM13472350-1
• Category: Main Products
• Molecular Weight: 156
• Molecular Formula: H6NaO6P
• Synonyms: Sodium dihydrogen phosphate dihydrate; Sodium Phosphate; Sodium phosphate,monobasic dihydrate
• IUPAC Name: sodium; dihydrogen phosphate; dihydrate
• Canonical SMILES: O.O.OP(=O)(O)[O-].[Na+]
• InChI: InChI=1S/Na.H3O4P.2H₂O/c;1-5(2,3)4;;/h;(H3,1,2,3,4);2*1H2/q+1;;;/p-1
• InChI Key: VBJGJHBYWREJQD-UHFFFAOYSA-M
• Boiling Point: 158ºC at 760 mmHg
• Melting Point: 60ºC
• Density: 1.91
• Appearance: solid
• Complexity: 61.9
• Covalently-Bonded Unit Count: 4
• EC Number: 231-449-2
• Exact Mass: 155.9799
• Formal Charge: 0
• Hazard Statements: Xi: Irritant
• H-Bond Acceptor: 6
• H-Bond Donor: 4
• Heavy Atom Count: 8
• MDL Number: MFCD00149209
• Monoisotopic Mass: 155.9799
• Physical State: White crystalline solid
• PubChem ID: 23673460
• Rotatable Bond Count: 0
• Safety Description: S24/25
• Stability: Stable.
• UNII: 5QWK665956
• WGK Germany: 1

Case Study

Preparation of PEO Coatings in Sodium Dihydrogen Phosphate Dihydrate Electrolyte Solution

Malinovschi, V., et al. Surface and Coatings Technology, 2019, 375, 621-636.

The growth of phosphorus-containing oxide layer on commercial pure titanium (CP-Ti) was achieved by plasma electrolytic oxidation (PEO) technology in sodium dihydrogen phosphate dihydrate (NaH2PO4·2H2O) acid electrolyte solution. The PEO layer contains polycrystalline rutile and anatase TiO2 phases and a small amount of amorphous phase, showing controllable corrosion resistance.
Preparation procedure of PEO coatings
· Aqueous solutions of sodium dihydrogen phosphate dihydrate (NaH2PO4·2H2O) were created using chemically pure reagents and distilled water at concentrations of 10 g/L, 20 g/L, and 30 g/L. The resulting electrolytes were measured for pH and electrical conductivity, which produced values of 5.0, 4.6, 4.4 for pH and 6.0, 11.9, 15.8 mS/cm for conductivity, respectively.
· Before the plasma electrolytic oxidation (PEO) treatment, sheets of CP-Ti grade 2 were cut into rectangular dimensions of 1.4 cm × 2.0 cm to serve as the metal substrate. These sheets were subjected to mechanical grinding using silicon carbide sandpaper with grit sizes 240, 320, and 1200. In addition, the samples underwent ultrasonic cleaning in acetone and double-distilled water for 10 minutes prior to the oxidation process.
· Three batches of samples with specific preparation conditions underwent plasma electrolytic oxidation treatment, which was conducted on the CP-Ti grade 2 samples with a unipolar pulsed DC power source operating at a frequency of 150 Hz.

Sodium Phosphate Dihydrate Used for the Growth of KDP Mixed Crystals

Meenatchi, V., et al. Optik, 2015, 126(23), 4032-4036.

Mixed crystals were prepared using sodium dihydrogen phosphate dihydrate (NaH2PO4·2H2O) at different concentrations as dopants and potassium dihydrogen phosphate KH2PO4 (KDP). Studies have shown that alkali metal Na(I) dopants are also incorporated into the crystal matrix, and morphological changes in doped samples are observed. Furthermore, second harmonic generation (SHG) efficiency increases significantly when the dopant concentration is equal to the concentration of the host material in the hybrid crystal.
Growth of Na(I)-incorporated KDP crystals
· KDP and sodium dihydrogen phosphate dihydrate (Na(I)), both obtained in fine grade, were employed in this experiment. The dopant was introduced in various ratios ranging from 0.33 to 0.75 mol%, specifically: (A) 1:1, (B) 1:1.5, (C) 1:2, (D) 1:3, (E) 1.5:1, (F) 2:1, and (G) 3:1. A saturated aqueous solution of KDP was prepared to facilitate crystal growth using two techniques: slow evaporation solution growth technique (SEST) and the Sankaranarayanan-Ramasamy (SR) method.
· Crystallization occurred over a period of 20 days, yielding high-quality, transparent crystals from the solution. The best quality seed crystals were selected for the preparation of bulk crystals. The seed crystals obtained from the conventional slow evaporation technique were utilized for unidirectional growth. A mixture of saturated sodium dihydrogen phosphate dihydrate and KDP, corresponding to ratios A, B, C, and D, was used in the SR method to grow larger single crystals unidirectionally under optimized growth conditions.