Jisho

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あさん 亜リン酸
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Noun, Noun which may take the genitive case particle 'no'
1. phosphonic acid (H3PO3); phosphorous acid​See also ホスホン酸
Wikipedia definition
2. Phosphorous acid​Phosphorous acid is the compound described by the formula H3PO3. This acid is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous acid is as an intermediate in the preparation of other phosphorus compounds.
Read “Phosphorous acid” on English Wikipedia
Read “亜リン酸” on Japanese Wikipedia
Read “Phosphorous acid” on DBpedia
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亜燐酸 【ありんさん】

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