Physical and chemical properties of ammonium dihydrogen phosphate

Density 1.02 g/mL at 20 °C

Boiling point 158ºC at 760 mmHg

Melting point 190 °C (dec.)(lit.)

Molecular formula H6NO4P

Molecular weight 115.026

Precise mass 115.003441

PSA 90.81000

Appearance White crystalline powder

Refractive index 1.4768

Storage conditions

1. It should be stored in a cool, ventilated, dry and clean warehouse, protected from moisture, high temperature and toxic substances, and should not be stored and transported together with toxic and harmful substances.

2. When transporting, prevent rain and hot sun. Loading and unloading should be careful and light, so as not to break the package.

3. In case of fire, it can be put out with water, sand and various fire extinguishers.

Stability

1.It can lose about 8% of ammonia in open air. 1g of the product is soluble in about 2.5mL water, slightly soluble in ethanol, insoluble in acetone. Aqueous solution is acidic, 0.2mol/L aqueous solution ph value 4.2. Stable in air, a small part of decomposition at 100 ℃, heated to 130 ℃ above the gradual decomposition of ammonia and water loss, and the formation of ammonium metaphosphate and phosphoric acid mixture. Freely soluble in water, slightly soluble in alcohol, insoluble in acetone. Stable in air, with a small part decomposition when heated to 100℃. Above the melting point, it loses ammonia and water and produces a mixture of ammonium metaphosphate and phosphoric acid. Aqueous solution is acidic (ph value of 1% solution is 4.5). Decomposes at 190.5°C. Has piezoelectric properties and changes from orthorhombic to rhombohedral crystal system at low temperature (-125°C), a point similar to that of potassium dihydrogen phosphate.

Water solubility 368 g/L (20 ºC)

Calculated chemistry

1. Calculated reference value of hydrophobic parameter (XlogP):None

2. Number of hydrogen bond donors:3

3. Number of hydrogen bond acceptors:4

4. Number of rotatable bonds:0

5. Number of reciprocal isomers:none

6. Polar surface area of topological molecules: 81.6

7. Number of heavy atoms: 6

8.Surface charge:0

9.Complexity:49.8

10.Number of isotope atoms:0

11.Number of determined atomic structure centers:0

12.Number of uncertain atomic structure centers:0

13.Number of definite bonding centers:0

14.Number of indeterminate bonding centers:0

15.Number of covalent bonding units:2

More 1. Property: Colorless and transparent crystals of square crystal system. Stable in air. 2. Density (g/mL,25/4℃): 1.803

3. relative vapor density (g/mL,air=1): not determined

4. melting point (ºC): 190

5. boiling point (ºC, atmospheric pressure): undetermined

6. boiling point (ºC, 5.2kPa): undetermined

7. refractive index: 1.525

8. Flash point (ºC): undetermined

9. specific rotation degree (º): not determined

10. auto-ignition point or ignition temperature (ºC): not determined

11. vapor pressure (kPa,25ºC): undetermined

12. saturation vapor pressure (kPa,60ºC): not determined

13. heat of combustion (KJ/mol): undetermined

14. critical temperature (ºC): undetermined

15. critical pressure (KPa): undetermined

16. the logarithmic value of the oil-water (octanol / water) partition coefficient: not determined

17. upper explosion limit (%,V/V): not determined

18. lower explosion limit (%,V/V): not determined

19. Solubility: 1g of product is soluble in 2.5ml of water. Slightly soluble in ethanol, insoluble in acetone. The aqueous solution is acidic.