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A5764

Sigma-Aldrich

Ammonium phosphate dibasic

reagent grade, ≥98.0%

Synonym(s):

Ammonium hydrogenphosphate, Diammonium hydrogenphosphate, di-Ammonium hydrogenphosphate (sec)

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About This Item

Linear Formula:
(NH4)2HPO4
CAS Number:
7783-28-0
Molecular Weight:
132.06
EC Number:
231-987-8
MDL number:
MFCD00010891
UNSPSC Code:
12352300
PubChem Substance ID:
329770835
NACRES:
NA.21
Assay:
≥98.0%
grade:
reagent grade
form:
powder or crystals
solubility:
water: soluble 132 g/L at 20 °C
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grade

reagent grade

Quality Level

100

Assay

≥98.0%

form

powder or crystals

pH

7.5-9.0 (25 °C, 132.1 g/L)

mp

155 °C (dec.) (lit.)

solubility

water: soluble 132 g/L at 20 °C

SMILES string

N.N.OP(O)(O)=O

InChI

1S/2H3N.H3O4P/c;;1-5(2,3)4/h2*1H3;(H3,1,2,3,4)

InChI key

MNNHAPBLZZVQHP-UHFFFAOYSA-N

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Application

Ammonium phosphate dibasic may be used in the following studies:
  • As an activator in generating activated carbon using waste ramulus mori as a source material.[1]
  • To compose the mobile phase for the removal of synthetic impurities from voriconazole by HPLC.[2]
  • Preparation of Eu ions doped oxyapatite Ca8Gd2(PO4)6O2 (CGP) samples.[3]
  • Syringe-type cartridge based electric field-assisted solid phase extraction of sunset yellow, an anionic dye.[4]

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
0000408272
MKCW5156
0000408272
MKCW0013
MKCT3291

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Burdock GA.
Encyclopedia of Food and Color Additives, 1, 144-144 (1997)
Study of metastable equilibria in the ternary system NH4H 2PO4-(NH4)2HPO4-H2O at -7 and -9 ?C.
Fluid Phase Equilibria, 354, 47-53 (2013)
Preparation and characterization of activated carbon from waste ramulus mori.
Tang YB, et al.
Chemical Engineering Journal, 203, 19-24 (2012)
Effect of Ammonium Salts on an Illitic Shale.
Bauleke MP and Dodd CM.
Journal of the American Ceramic Society. American Ceramic Society, 40(10), 325-334 (1957)
Electric Field-Assisted Solid Phase Extraction: Study of Electrochromatographic Parameters with an Anionic Model Compound.
Orlando RM, et al.
Journal of the Brazilian Chemical Society, 26(2), 310-318 (2015)
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Questions

1–2 of 2 Questions  

  1. What is the Pka of Ammonium Phosphate dibasic?

    1 answer

    1. Phosphate (phosphoric acid) salts have the following pKa values: k1=2.15, k2=6.82, k3=12.38.

      Helpful?

  2. Why is the water solubility so much lower than the 57-58% reported elsewhere?

    1 answer

    1. The solubility of this product is tested at 100 mg/mL in water while the product page suggests it is soluble at 132 g/L (132 mg/mL) in water. Neither of these are reported to be the maximum solubility rate, however these concentrations are suitable for most applications. The CRC Handbook lists the solubility of this compound at 69.5g/100g water. This is the rate published on PubChem. This information may be reviewed at the link below:
      https://pubchem.ncbi.nlm.nih.gov/compound/24540#section=Solubility

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