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Potassium oxalate

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Potassium oxalate Basic information
Potassium oxalate Chemical Properties
Potassium oxalate Usage And Synthesis
  • Chemical PropertiesColorless, transparent crystals; odorless. Soluble in water.
  • Chemical PropertiesThe anhydrous salt, mol wt 166.22, is obtained when the monohydrate is dehydrated at 160 °C. The monohydrate is preferred as a reagent in analytical chemistry and in miscellaneous uses principally because of its high solubility as compared with other simple neutral oxalates.
  • UsesPotassium oxalate is a white crystal or powder made by neutralizing oxalic acid with potassium carbonate. It is soluble in water 1:3 but not in alcohol. Potassium oxalate was used as an early developer for gelatin plates but is best known as the developer for platinum prints.
  • UsesCleaning and bleaching straw, removing stains in photography; in vitro blood anticoagulant; also in analytical chemistry.
  • General DescriptionPotassium oxalate, K2C204, H20, is odorless, efforescent, water-soluble, colorless crystals that decompose when heated. Sinks in and mixes slowly with water. Used in analytical chemistry and photography, and as a bleach and oxalic acid source.
  • Air & Water ReactionsWater soluble.
  • Reactivity ProfilePotassium oxalate gives basic aqueous solutions. Reacts as a base to neutralize acids in reactions that generate heat, but less than is generated by neutralization of the bases in reactivity group 10. Can serve as a reducing agent in reactions that generate carbon dioxide.
  • HazardToxic by inhalation and ingestion.
  • Health HazardInhalation of dust can cause systemic poisoning. Ingestion causes burning pain in throat, esophagus, and stomach; exposed areas of mucous membrane turn white; vomiting, severe purging, weak pulse, and cardiovascular collapse may result; if death is delayed, neuromuscular symptoms develop. Contact with eyes or skin causes irritation.
  • Fire HazardBehavior in Fire: Loses water at about 160° and decomposes to carbonate with no charring. The reaction is not hazardous.
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