Standard solutions of calcium ion used to test for water hardnessare prepared by dissolving pure calcium carbonate,CaCO3, in dilute hydrochloric acid. A 1.440-g sample ofCaCO3 is placed in a 250.0-mL volumetric flask and dissolved in HCl. Then the solution is diluted to the calibrationmark of the volumetric flask. Calculate the resulting molarity of the calcium ion.