Phosphorous acid (phosphorous acid) - Arinsan (English spelling) phosphorous acid

Japanese: 亜リン酸(亜燐酸) - ありんさん(英語表記)phosphorous acid
Phosphorous acid (phosphorous acid) - Arinsan (English spelling) phosphorous acid
The chemical formula is H 3 PO 3 . It is not known to exist as a free acid, even in aqueous solutions. Known esters include phosphite, P(OR) 3. What was once called phosphorous acid is actually phosphonic acid, H 2 PHO 3. Phosphonic acid is obtained by hydrolysis of phosphorus trichloride. In the laboratory, it is made by dissolving it in carbon tetrachloride, slowly dripping water into it while cooling with ice, and then removing the hydrochloric acid. It forms colorless, deliquescent ice crystals.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
化学式H3PO3。遊離酸としては水溶液中でもその存在は知られていない。エステルとして亜リン酸エステルP(OR)3などが知られている。古く亜リン酸と呼ばれていたものは実際にはホスホン酸phosphonic acid H2PHO3であることがわかっている。ホスホン酸は,三塩化リンを加水分解させて得られる。実験室では,四塩化炭素溶液とし,氷冷しながら徐々に水を滴下した後,脱塩酸して作る。無色,潮解性の氷状結晶。

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