179922
Potassium phthalate monobasic
ACS reagent, acidimetric standard
Synonym(s):
KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate
About This Item
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grade
ACS reagent
Quality Level
Assay
99.95-100.05% dry basis
form
crystals
quality
acidimetric standard
impurities
≤0.002% S compounds
≤0.003% Cl compounds
≤0.005% insolubles
pH
4.00-4.02 (25.0 °C±0.2 °C, 0.05 M)
mp
295-300 °C (dec.) (lit.)
cation traces
Fe: ≤5 ppm
Na: ≤0.005%
heavy metals: ≤5 ppm (by ICP)
functional group
carboxylic acid
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Related Categories
1 of 4
This Item | NIST185I | 1.04874 | NIST2185 |
---|---|---|---|
99.95-100.05% dry basis | - | ≥99.5% dry basis (perchloric acid titration) | - |
200 | 100 | 300 | 100 |
ACS reagent | certified reference material | - | certified reference material |
4.00-4.02 (25.0 °C±0.2 °C, 0.05 M) | - | 4.0 (20 °C, 50 g/L in H2O) | - |
Fe: ≤5 ppm, heavy metals: ≤5 ppm (by ICP), Na: ≤0.005% | - | Cu: ≤0.0002%, Fe: ≤0.0005%, Na: ≤0.01%, Pb: ≤0.0005%, heavy metals (as Pb): ≤0.0005% | - |
Storage Class Code
13 - Non Combustible Solids
WGK
WGK 1
Flash Point(F)
387.1 °F - Pensky-Martens closed cup
Flash Point(C)
197.3 °C - Pensky-Martens closed cup
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