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ca oh 2 + co2 → caco3 + h2o
ca oh 2 co2 → caco3 h2o
caco3 co2 h2o → ca hco3 2
co2 + h2o + ca oh 2
co2 + caco3 + h2o
caco3 + h2o
h2o+caco3
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