Molekula
Potassium hydrogen phthalate
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 organic acid salt widely used as a primary standard in acid-base titrations, pH buffer preparation, and analytical chemistry for precise calibration. It is non-hazardous and stable under normal conditions. This chemical has a CAS number of 877-24-7, with the molecular formula HOOCC6H4COOK and a molecular weight of 204.22. It is stored at ambient temperatures and carries no signal word for hazard classification. Molekula supplies potassium hydrogen phthalate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
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1 kg — £62.00 per pack ex VAT · £74.40 inc. VAT
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Specifications
| Property | Value |
|---|---|
| Appearance | White powder |
| Loss on Drying | ≤ 0.1% |
| Assay | ≥ 99.0% |
| Lead (Pb) | ≤ 0.001% |
| Identification (IR) | Conforms to Reference |
| Ammonium (NH4+) | ≤ 0.01% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 13173220 |
| 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, Russian, 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
- 1,2-Benzenedicarboxylic acid, monopotassium salt
- 1,2-Benzenedicarboxylic acid, potassium salt (1:1)
- Hydrogen potassium phthalate
- KHP
- Monopotassium phthalate
- Phthalic acid monopotassium salt
- Potassium acid phthalate
- Potassium biphthalate
- Potassium phthalate monobasic
- potassium;2-carboxybenzoate
Frequently asked questions
What is potassium hydrogen phthalate (KHP) commonly used for?
Potassium hydrogen phthalate is primarily used as a **primary standard in acid-base titrations** for calibrating pH meters, volumetric solutions, and analytical instruments due to its high purity and stability.
What is the chemical formula and molecular weight of potassium hydrogen phthalate?
The chemical formula is **HOOCC₆H₄COOK**, and the molecular weight is **204.22 g/mol**.
How should potassium hydrogen phthalate be stored?
Store at **ambient temperature** in a cool, dry place, away from strong acids, bases, or oxidizing agents. Keep the container tightly sealed.
What grades of potassium hydrogen phthalate does Molekula supply?
Molekula supplies **analytical reagent (AR) grade** potassium hydrogen phthalate, meeting strict purity requirements for laboratory use.
Can Molekula supply potassium hydrogen phthalate in bulk quantities?
Yes, we offer potassium hydrogen phthalate in **bulk packaging** (e.g., 5 kg, 25 kg, and custom quantities) for industrial or large-scale laboratory applications.
What documentation comes with an order of potassium hydrogen phthalate?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and a **batch-specific purity report** for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.