Description

Di-Potassium Phthalate is a high-purity potassium salt of phthalic acid, widely recognized for its utility as a primary standard in analytical chemistry. Its precise stoichiometry and stability make it an essential reagent for the standardization of acids and bases, ensuring accuracy in titrimetric analysis. This compound is critical for quality control laboratories in the pharmaceutical, chemical manufacturing, and water treatment industries, where reliable analytical results are paramount.

Application

• Primary Standard in Titration: Used for the precise standardization of perchloric acid in non-aqueous titrations and other volumetric analysis.
• Pharmaceutical Analysis: Serves as a critical reference material in pharmacopeial testing (e.g., USP, EP) for assay and purity determinations.
• Buffer Component: Can be utilized in the preparation of standard buffer solutions for pH meter calibration.
• Chemical Synthesis: Acts as a starting material or intermediate in the synthesis of specialized organic compounds and dyes.
• Laboratory Reagent: Employed in general analytical and research laboratories as a high-purity analytical reagent.
• Educational Use: A standard compound for teaching principles of analytical chemistry and quantitative analysis in academic settings.

Basic Information

Product Name	Di-Potassium Phthalate
CAS No.	4409-98-7
Molecular Formula	C8H4K2O4
Molecular Weight	242.32 g/mol
Synonyms	Potassium Hydrogen Phthalate, Dipotassium Phthalate; Potassium Phthalate; Phthalic Acid Dipotassium Salt; 1,2-Benzenedicarboxylic Acid, Dipotassium Salt; KHP (for the monopotassium salt, commonly confused); Dipotassium 1,2-benzenedicarboxylate
EINECS	224-560-1

Quality Control

Our Di-Potassium Phthalate is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity suitable for analytical applications. Each lot is tested against rigorous in-house specifications, which typically include assay, identification, loss on drying, and heavy metals. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after each use to prevent moisture absorption, which can affect the product's purity and analytical performance.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 99.0%
Loss on Drying	≤ 0.5%
pH (5% solution)	Contact for details
Heavy Metals (as Pb)	≤ 10 ppm
Chloride (Cl)	≤ 0.01%
Sulfate (SO4)	≤ 0.01%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.