calcium bicarbonate
A salt obtained by replacing only one of the two
hydrogen atoms in carbonic acid (H 2 CO
3 ) by the metallic atom calcium,
giving (Ca(HCO 3 )2). It is employed in
a 0.2% solution to carbonate excess calcium
hydroxide used in deacidifying paper, and also to
precipitate calcium carbonate into the fibers of
the paper being treated. The precipitated calcium
carbonate acts as a buffer to neutralize any acid
that forms in the paper subsequent to treatment.
(31 )
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