Water Hardness Part A - Continue to Part B

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.

1. A 25.0 mL sample of municipal tap water requires 12.66 mL of soap solution before the appearance of permanent suds. If 1.00 mL of soap solution titrates 0.78 mg CaCO₃, what is the ppm CaCO₃ in the tap water?