Potassium hydrogen phthalate
Potassium hydrogen phthalate (CAS 877-24-7), with the molecular formula HOOCC<sub>6</sub>H<sub>4</sub>COOK and a molar mass of 204.22 g/mol, is a versatile inorganic salt. It is frequently employed as a primary standard in acid-base titrations due to its high purity and stability. This compound serves as a crucial reagent in chemical synthesis and analytical chemistry laboratories, offering reliable performance for quantitative analysis and research applications.
- IUPAC
- KHP,Phthalic acid monopotassium salt,Potassium biphthalate,Potassium hydrogen phthalate,Potassium phthalate monobasic
- Synonyms
- KHPPhthalic acid monopotassium saltPotassium biphthalatePotassium hydrogen phthalatePotassium phthalate monobasic
Primary Standard in Titrimetry
Potassium hydrogen phthalate is widely recognised and utilised as a primary standard for the calibration of analytical instruments and standardisation of basic solutions in acid-base titrations.
Buffer Preparation
Its acidic nature makes it suitable for preparing buffer solutions within a specific pH range, essential for maintaining stable reaction conditions in various chemical and biochemical processes.
Reagent in Chemical Synthesis
This compound acts as a valuable reagent in organic synthesis, participating in reactions requiring a phthalate source or a potassium salt.
Analytical Chemistry
Utilised in analytical laboratories for a range of testing procedures, contributing to accurate quantitative measurements.
| Molecular weight | 204.22 |
|---|---|
| Linear formula | HOOCC6H4COOK |
| Assay | ≥99.95% |
| Solubility | H2O: soluble0.1 M at 20 °C, clear, colorless |
| pH | 3.5-5.0 (25 °C, 0.1 M in H2O) |
| Loss on drying | ≤0.05% loss on drying, 110 °C |
| Impurities tested | <0.005% Phosphorus (P) |
| Melting point | 295-300 °C (dec.)(lit.) |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 2 |
| Cation traces | Al: Ca: Cu: Fe: Mg: NH4+: Na: Pb: Zn: <0.0005% |
| Anion traces | chloride (Cl-): sulfate (SO42-): <0.002% |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Product Line | BioXtra |
|---|---|
| Absorption | absorption0.1M/309 nm, H2O cut-off |
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Potassium hydrogen phthalate used for?
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Potassium hydrogen phthalate (CAS 877-24-7) is primarily used as a primary standard in acid-base titrations for standardising solutions and calibrating instruments. It is also employed in the preparation of buffer solutions and as a reagent in chemical synthesis and analytical chemistry.
What is the CAS number and formula for Potassium hydrogen phthalate?
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The CAS number for Potassium hydrogen phthalate is 877-24-7, and its linear formula is HOOCC<sub>6</sub>H<sub>4</sub>COOK.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Potassium hydrogen phthalate with an assay of ≥99.95%. It is not represented as USP, BP, or EP grade unless explicitly stated in the product specifications.
What are the safety and handling precautions for Potassium hydrogen phthalate?
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Potassium hydrogen phthalate is classified under WGK Germany 2. When handling, it is recommended to wear eyeshields and gloves. A type N95 (US) or type P1 (EN143) respirator filter should be used if respiratory protection is necessary. Avoid contact with eyes and skin.
Is Potassium hydrogen phthalate a controlled substance?
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Based on the provided data, Potassium hydrogen phthalate (CAS 877-24-7) is not indicated as a controlled substance.
How is Potassium hydrogen phthalate packed, shipped, and exported?
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Tech Serve Solutions specialises in the global supply and export of fine chemicals, ensuring appropriate packaging and adherence to international shipping regulations for safe and compliant delivery.
How can I request a quote or sample for Potassium hydrogen phthalate?
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To request a quote or a sample of Potassium hydrogen phthalate, please contact the Tech Serve Solutions sales team via our website or direct inquiry channels.
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