If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
179922
Potassium phthalate monobasic
ACS reagent grade, 99.95-100.05% dry basis, crystals, acidimetric standard
Synonym(s):
KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate
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About This Item
Product Name
Potassium phthalate monobasic, ACS reagent, acidimetric standard
grade
ACS reagent
Quality Segment
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.)
solubility
water: soluble (93 g/l at 30 °C (86 °F))
anion traces
chlorine and bromine (as Cl-): ≤0.003%, sulfur compounds (as SO42-): ≤0.002%
cation traces
Fe: ≤5 ppm, Na: ≤0.005%, heavy metals: ≤5 ppm (by ICP)
functional group
carboxylic acid
SMILES string
[K+].OC(=O)c1ccccc1C([O-])=O
InChI
1S/C8H6O4.K/c9-7(10)5-3-1-2-4-6(5)8(11)12;/h1-4H,(H,9,10)(H,11,12);/q;+1/p-1
InChI key
IWZKICVEHNUQTL-UHFFFAOYSA-M
Application
1 of 1
This Item | |||
|---|---|---|---|
| form crystals | form - | form solid | form - |
| solubility water: soluble (93 g/l at 30 °C (86 °F)) | solubility - | solubility water: soluble (93 g/l at 30 °C (86 °F)) | solubility - |
| assay 99.95-100.05% dry basis | assay - | assay ≥99.5% (T) | assay - |
| Quality Level 200 | Quality Level 300 | Quality Level 200 | Quality Level - |
| grade ACS reagent | grade certified reference material, TraceCERT® | grade - | grade reagent grade |
| pH 4.00-4.02 (25.0 °C±0.2 °C, 0.05 M) | pH 4 | pH 4 | pH - |
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wgk
WGK 1
flash_point_f
387.1 °F - Pensky-Martens closed cup
flash_point_c
197.3 °C - Pensky-Martens closed cup
ppe
Eyeshields, Gloves, type N95 (US)
Storage Class
11 - Combustible Solids
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How can I determine the shelf life / expiration / retest date of this product?
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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