| http://www.w3.org/ns/prov#value | - Preferred, however, is formaldehyde in aqueous solution in aconcentration of between 37 and 50 percent by weight.In order to maintain alkaline conditions during the condensation reaction, an inorganic alkaline or basic material soluble in water is used, such as sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate or barium hydroxide.
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