Water Hardness Part B - Back to Part A

Answer the following questions. Show all work and calculations to support your answers. Include the correct units and the proper number of significant figures on numerical answers. Circle your final answers.

2. What is the molarity of Ca²⁺ in the municipal tap water of the previous question in Part A? (Hint: Conver ppm or mg CaCO₃/L solution to M = mol Ca²⁺/L soln.

3. Would the municipal tap water be classified as hard or soft water? (Hint: See Scientific Background in the lab manual.)

4. Use dimensional analysis to show that 215 ppm CaCO₃ is equivalent to 215 mg CaCO₃ per liter of solution. Assume the density of the solution is 1.00 g/mL.