Overview
Potassium chromate is an inorganic salt composed of potassium ions and chromate anions, widely recognized for its vibrant yellow color and strong oxidizing properties. As an analytical reagent grade chemical ('分析纯' in Chinese), it meets strict purity standards for laboratory and industrial applications. The compound has been historically significant in analytical chemistry, particularly in precipitation titrations where it serves as an indicator for silver ions. Its production typically involves the reaction of potassium hydroxide with chromium trioxide or the oxidation of chromium(III) compounds.
Physical and Chemical Properties
Potassium chromate forms orthorhombic crystals at room temperature, which readily dissolve in water to form yellow solutions. The compound exhibits excellent thermal stability, maintaining its crystalline structure up to 968°C before melting. Chemically, it is a powerful oxidizing agent that reacts vigorously with reducing substances. In acidic conditions, potassium chromate converts to orange dichromate (Cr₂O₇²⁻), demonstrating pH-dependent chromate-dichromate equilibrium. Its solubility decreases in the presence of potassium ions due to the common ion effect.
Main Applications
In analytical chemistry, potassium chromate serves as a primary standard for argentometric titrations (Mohr method) to determine chloride concentrations. The distinct color change from yellow to red-brown silver chromate precisely indicates the titration endpoint. Industrial applications include its use as a corrosion inhibitor in cooling systems, though this use has declined due to environmental concerns. Other significant uses include pigment manufacturing (chrome yellows), textile dyeing mordant, and wood preservative formulations. In photography, it finds application in certain bleaching solutions.
Safety and Storage
As a hexavalent chromium compound, potassium chromate poses significant health hazards including carcinogenicity, mutagenicity, and reproductive toxicity. Proper personal protective equipment (gloves, goggles, respirators) must be used when handling this substance. Storage requires segregation from acids, organic materials, and reducing agents in cool, dry conditions. Secondary containment is recommended to prevent environmental contamination. Spills should be contained using inert absorbents and disposed of as hazardous waste according to local regulations.
B2B Procurement Guide
When sourcing analytical grade potassium chromate, buyers should verify certificates of analysis confirming ≥99.5% purity and low heavy metal content. Bulk purchases (25kg drums) typically offer better unit pricing compared to small laboratory quantities. Due to hazardous material shipping restrictions, procurement specialists should coordinate with certified chemical distributors who provide proper UN-certified packaging and transportation documentation. Consider regional regulations - some jurisdictions require special permits for hexavalent chromium compounds.
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