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1.05002

Potassium hydroxide hydrate

99.995 Suprapur®

Synonym(s):

Potassium hydroxide hydrate, caustic potash monohydrate

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Size/SKUAvailabilityPrice
500 g

Estimated to ship onJuly 23, 2026

$1,400.00

About This Item

Empirical Formula (Hill Notation):
HKO · xH2O
CAS Number:
Molecular Weight:
56.11 (anhydrous basis)
MDL number:
UNSPSC Code:
12352305
EC Index Number:
246-324-8
NACRES:
NA.21
Assay:
99.995%
Form:
solid

$1,400.00


Estimated to ship onJuly 23, 2026Details


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Quality Segment

description

for inorganic trace analysis

assay

99.995%

form

solid

potency

333 mg/kg LD50, oral (Rat)

pH

>13.5 (20 °C, 50 g/L in H2O)

bp

1320 °C/1013 hPa

mp

143 °C

storage temp.

2-30°C

SMILES string

[K+].[O-H].O

InChI

1S/K.2H2O/h;2*1H2/q+1;;/p-1

InChI key

LUMVCLJFHCTMCV-UHFFFAOYSA-M

Analysis Note

Purity (metallic): ≥ 99.995 %
Assay of KOH‧1H₂O: ≥ 85 %
Assay of potassium carbonate: ≤ 1.0 %
Chloride (Cl): ≤ 1.0 ppm
Phosphate (PO₄): ≤ 0.05 ppm
Silicate (as SiO₂): ≤ 5 ppm
Sulfate (SO₄): ≤ 5 ppm
Al (Aluminium): ≤ 0.05 ppm
As (Arsenic): ≤ 0.1 ppm
Ba (Barium): ≤ 10.0 ppm
Ca (Calcium): ≤ 0.5 ppm
Cd (Cadmium): ≤ 0.01 ppm
Ce (Cerium): ≤ 0.01 ppm
Co (Cobalt): ≤ 0.010 ppm
Cr (Chromium): ≤ 0.010 ppm
Cu (Copper): ≤ 0.010 ppm
Eu (Europium): ≤ 0.010 ppm
Fe (Iron): ≤ 0.05 ppm
Hg (Mercury): ≤ 0.01 ppm
La (Lanthanum): ≤ 0.010 ppm
Li (Lithium): ≤ 0.5 ppm
Mg (Magnesium): ≤ 0.10 ppm
Mn (Manganese): ≤ 0.050 ppm
Na (Sodium): ≤ 5 ppm
Ni (Nickel): ≤ 0.010 ppm
Pb (Lead): ≤ 0.010 ppm
Sc (Scandium): ≤ 0.010 ppm
Sm (Samarium): ≤ 0.010 ppm
Sr (Strontium): ≤ 0.50 ppm
Tl (Thallium): ≤ 0.01 ppm
Y (Yttrium): ≤ 0.010 ppm
Yb (Ytterbium): ≤ 0.010 ppm
Zn (Zinc): ≤ 0.050 ppm

Legal Information

SUPRAPUR is a registered trademark of Merck KGaA, Darmstadt, Germany

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This Item
1.050121.050291.05033
assay

99.995%

assay

≥84.0% KOH basis (acidimetric)

assay

85.0-100.5% KOH basis

assay

≥85.0% KOH basis (acidimetric)

Quality Level

100

Quality Level

200

Quality Level

300

Quality Level

300

form

solid

form

solid

form

solid

form

solid

storage temp.

2-30°C

storage temp.

2-30°C

storage temp.

2-30°C

storage temp.

2-30°C

pH

>13.5 (20 °C, 50 g/L in H2O)

pH

14 (20 °C, 56 g/L in H2O)

pH

14 (20 °C, 56 g/L in H2O)

pH

14 (20 °C, 56 g/L in H2O)

bp

1320 °C/1013 hPa

bp

-

bp

-

bp

-


pictograms

CorrosionExclamation mark

signalword

Danger

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A

Storage Class

8A - Combustible corrosive hazardous materials

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable



Certificates of Analysis (COA)

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