# Chemistry

A 0.512g sample of CaCO3 is dissolved in 12M HCl and the mixture is diluted to 250ml. A. Calculate the concentration of Ca+2 in the 250ml solution?
B. How many moles of Ca+2 are in a 25ml sample of th 250ml solution?

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1. 1 mol CaCO3 contains 1 mol Ca^2+.
mols CaCO3 in 0.512 g = grams/molar mass = ?
M Ca^2+ = mols Ca^2+/L = ?
mols Ca^2+ in 25 mL is 1/10 mols in 250 mL.

Post your work if you get stuck.

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