Hydrogen may also be obtained by the action of zinc on ammonium salts (the nitrate excepted) (Lorin, Comptes rendus, 1865, 60, p. 745) and by heating the alkali formates or oxalates with caustic potash or soda, Na2C204+2NaOH = H 2 +2Na 2 CO 3.
Formates are also produced by the action of moist carbon monoxide on soda lime at 190-220° C. (V.
The salts of the acid are known as formates, and are mostly soluble in water, those of silver and lead being the least soluble.
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