Standard solutions of calcium ion used to test for water hardness are prepared by dissolving pure...

Question:

Standard solutions of calcium ion used to test for water hardness are prepared by dissolving pure calcium carbonate, CaCO3, in dilute hydrochloric acid. A 1.579 g sample of CaCO3 is placed in a 150.0 mL volumetric flask and dissolved in HCl. Then the solution is diluted to the calibration mark of the volumetric flask. Calculate the resulting molarity of calcium ion. Molarity M
For convenience, one form of sodium hydroxide that is sold commercially is the saturated solution. This solution is 19.4 M, which is approximately 50% by mass sodium hydroxide. What volume of this solution would be needed to prepare 5.06 L of 5.42 M NaOH solution? Volume mL
What volume of 0.616 M NaOH solution would be required to neutralize 26.7 mL of 0.304 M HNO3 solution? Volume mL

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