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lorez
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Post by lorez »

Blackboard chalf contains mixture of limestone (Ca(O3) and gypsum (CaSO4). But only the limestone react with dilute HCL according to

CaCO3= 2H4-->CaCl2=CO2=H2O

Whst is the mass% of limestone in a 5.26g piece of chalt that yield 3.25g of Cac1 when it react with excess HCl.
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