| http://www.w3.org/ns/prov#value | - Examples of suitable bases are alkali metal hydroxides, ammonia and basic ammonium salts such as ammonium carbonate, aliphatic amines such as mono-, di- and trialkylamines having generally up to four carbon atoms, heterocyclic amines such as morpholine and piperazine, and alkanolamines such as mono-, di- and trialkanolamines, and mono- and dialkanolalkylamines having usually up to four carbon atom
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