Medium |
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| acetaldehyde |
 |
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| acetic acid |
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 |
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 |
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| acetic acid anhydride, free of water |
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| acetone |
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| acetylene |
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| alum, aqueous solution |
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| aluminium salts, aqueous solution * |
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| ammonia |
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| ammonium salts, aqueous solution * |
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| aniline |
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| asphalt |
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* Salts are:
nitrates, nitrites, sulphates, sulphides, chlorides, acetates, tartrates, cyanides, phosphates, oxalates, etc.
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