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60220-M

Potassium phosphate monobasic

Name: Potassium phosphate monobasic
Brand: SIAL

buffer substance, anhydrous, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., 99.5-100.5%

Synonym(s):

Potassium dihydrogen phosphate, prim.-Potassium phosphate

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About This Item

Linear Formula:

KH₂PO₄

CAS Number:

7778-77-0

Molecular Weight:

136.09

NACRES:

NA.21

PubChem Substance ID:

329758828

UNSPSC Code:

12352302

EC Number:

231-913-4

MDL number:

MFCD00011401

eCl@ss:

38070209

Assay:

99.5-100.5%

Form:

crystalline

Solubility:

water: soluble (208 g/l at 20 °C (68 °F))

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Properties

agency

reag. ISO, reag. Ph. Eur.

grade

ACS reagent, anhydrous, puriss. p.a.

assay

99.5-100.5%

form

crystalline

impurities

≤0.001% total nitrogen (N)

loss

≤0.2% loss on drying, 105 °C

pH

4.2-4.5 (20 °C, 5%)

pKa (25 °C)

(1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)

bp

>450 °C

mp

252.6 °C (lit.)

solubility

water: soluble (208 g/l at 20 °C (68 °F))

density

2.338 g/mL at 25 °C (lit.)

anion traces

chloride (Cl^-): ≤5 mg/kg, sulfate (SO₄^2-): ≤30 mg/kg

cation traces

As: ≤0.5 mg/kg, Ca: ≤10 mg/kg, Cd: ≤5 mg/kg, Co: ≤5 mg/kg, Cr: ≤15 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, Mg: ≤5 mg/kg, Mn: ≤5 mg/kg, Na: ≤50 mg/kg, Ni: ≤5 mg/kg, Pb: ≤5 mg/kg, Zn: ≤5 mg/kg, heavy metals: ≤0.001% (by ICP-OES)

SMILES string

[K+].OP(O)([O-])=O

InChI

1S/K.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1

InChI key

GNSKLFRGEWLPPA-UHFFFAOYSA-M

Description

General description

Potassium phosphate monobasic is a soluble salt employed as heterogeneous catalyst, additive, fungicide, buffer, and plant fertilizer.

Application

Potassium phosphate monobasic can be used as a catalyst:

In the regioselective monobromination of aralkyl ketones to synthesize monobrominated ketones.
To synthesize acridine-1,8-diones and hexahydroquinolines via Hantzsch type reaction.

It can also be used as an additive in the oxidation of alcohols to aldehydes. The role of KH₂PO₄was to regulate the pH of the solution, which affected the rate at which hydroxyl radicals were generated. As a result, the reaction′s selectivity was improved.

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Storage Class

11 - Combustible Solids

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

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