sodium carbonate
A mild alkaline (Na2CO 3 ), also known
as "soda" or "soda ash." It is prepared by
dissolving ammonia in purified brine, the
resulting solution being treated with carbon
dioxide. It is used in leather manufacture,
particularly in chrome tannages, to control pH,
and, in the manufacture of paper, in the
preparation of chemical pulps. (144 , 306 )
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