A 0.430-g sample of CaCO3 is dissolved in 12 M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. a. How many moles of CaCO3 are used (M.W. = 100.1 g/mol)?  b. What is the molarity of the Ca2+ in the 250 mL of solution? c. How many moles of Ca2+ in a 25.0-mL aliquot of the soln in b.?

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