Molekula
Potassium hydrogen phthalate standard - NIST-2185
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Potassium hydrogen phthalate (KHP) is a high-purity analytical standard primarily used for acid-base titrations to calibrate solutions like sodium hydroxide, ensuring accurate pH and concentration measurements. It serves as a primary standard due to its stability, non-hygroscopic nature, and precise stoichiometry. This NIST-traceable reference material (CAS 877-24-7) has a molecular formula of HOOCC6H4COOK and a molecular weight of 204.22 g/mol. It requires no special storage—store at ambient conditions—and carries no signal word for hazard classification. Molekula supplies Potassium hydrogen phthalate standard - NIST-2185 from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
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Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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Specifications
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90035050 |
| CAS Number | 877-24-7 |
| IUPAC Name | potassium 2-carboxybenzoate |
| EC Number | 212-889-4 |
| Molecular Formula | HOOCC6H4COOK |
| Molecular Weight | 204.22 |
| Exact Mass | 203.9825 |
| SMILES | C1=CC=C(C(=C1)C(=O)O)C(=O)[O-].[K+] |
| InChIKey | IWZKICVEHNUQTL-UHFFFAOYSA-M |
| InChI | 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 |
| PubChem CID | 23676735 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 2917.39.7000 |
| Tariff Code | 2917398590 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is Potassium hydrogen phthalate (NIST-2185) primarily used for?
This NIST-traceable standard is used for acid-base titrations, pH buffer solutions, and calibration of analytical instruments like potentiometers and pH meters.
What is the chemical formula and molecular weight of Potassium hydrogen phthalate?
The formula is **HOOCC₆H₄COOK**, and the molecular weight is **204.22 g/mol**.
How should Potassium hydrogen phthalate (NIST-2185) be stored?
Store at **ambient temperature** in a tightly sealed container, away from moisture and strong oxidizing agents.
What grade is this Potassium hydrogen phthalate, and is it suitable for analytical work?
This is a **NIST-traceable standard (NIST-2185)**, certified for high-precision analytical applications, including calibration and reference purposes.
Can Molekula supply Potassium hydrogen phthalate in bulk quantities?
Bulk quantities may be available upon request—please contact our sales team for pricing and minimum order quantities.
What documentation comes with the order of NIST-2185 Potassium hydrogen phthalate?
Each order includes a **Certificate of Analysis (CoA) with NIST traceability**, batch-specific data, and compliance with ISO/IEC 17025 standards.
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