1) A 50.0 mL water sample required 5.14 mL of 0.0100 M Na2H2Y to reach the endpoint for the titration procedure described in this experiment.
A. Calculatethe moles of hardening ions in the water sample.
B. Assuming the hardness is due exclusively to CaCO3, express the hardness concentration in mg CaCO3/L sample.
C. What is this hardness concentration expressed in ppm CaCO3?
D. Classify the hardness of this water according to Table 24.1.
2) The hardness of a water sample is known to be 500 ppm? CaCO3. In an analysis of a 50 mL water sample, what volume of 0.0100 M Na2H2Y is needed to reach the endpoint?