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Oxalic acid formula ​

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User Nishad
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(COOH)₂ is the one usually used by most teachers
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User Mweber
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The formula of oxalic acid is (C2H2O4); its usual form is that of the crystalline hydrate, (COOH)2·2H2O. Known as a constituent of wood sorrel as early as the 17th century, oxalic acid was first prepared synthetically in 1776.
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User Gladysbixly
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