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Limestone to pure calcium carbonate process.Apr 19, 2018 the carbonate ion co 3 has a valency of -2 and forms compounds with sodium na, which has a valency of 1, and calcium ca, which has a valency of 2.The resulting compounds are sodium carbonate na 2 co 3 and calcium carbonate caco 3.The former is known as soda ash or washing soda, and the latter, known as calcite, is a.
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