しゅう酸ジカリウム 化学特性,用途語,生産方法
解説
【Ⅰ】K2C2O4(166.22)．水酸化カリウムまたは炭酸カリウムの水溶液に，計算量のシュウ酸を加え，冷却すると一水和物が析出する．一水和物は，無色の単斜晶系結晶．C-C1.57 Å，C-O 1.25～1.26 Å．一水和物は風解性がある．約160 ℃ で無水物になる．さらに加熱すると約370 ℃ でK2CO3になる．無水物は密度2.13 g cm－3．水に易溶．写真のしみ抜き，血液凝固防止剤，麦ワラの漂白，分析試薬などに用いられる．[CAS 583-52-8]【Ⅱ】シュウ酸水素カリウム：KHC2O4(128.13)．シュウ酸カリウム水溶液に計算量のシュウ酸を加え，冷却すると一水和物が析出する．これを加熱脱水すると無水物が得られる．木材の洗浄，インキ消し，染色の媒染剤，写真のしみ抜きなどに用いられる．
森北出版「化学辞典（第2版）
化学的特性
Colorless, transparent crystals; odorless.
Soluble in water.
使用
Potassium 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.
一般的な説明
Potassium 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.
空気と水の反応
Water soluble.
反応プロフィール
Potassium 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.
危険性
Toxic by inhalation and ingestion.
健康ハザード
Inhalation 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.
火災危険
Behavior in Fire: Loses water at about 160° and decomposes to carbonate with no charring. The reaction is not hazardous.
しゅう酸ジカリウム 上流と下流の製品情報
原材料
準備製品