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| phos·pho·rous ac·id |
noun |
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| Definition: |
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1. white or yellowish crystalline solid: a white or yellowish crystalline solid that absorbs water from the atmosphere. Use: reducing agent, production of phosphite salts. H3PO3
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2. dibasic acid formed from phosphorus pentoxide: an acid of a group formed by the combination of phosphorus pentoxide with water, each acid having one less oxygen atom than the corresponding phosphoric acid
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