Answer Happy

EXERCISE 21: Calculate the following and their corresponding uncertainties given this data: A. Molarity of Ca standard solution B. Molarity of EDTA C. Molarity of Ca in water sample D. Mass of CaCO2 in water sample E. Water Hardness (as ppm CaCO2)
Preparation of Ca- standard solution Mass of CaCO3 (9) Initial mass of bottle + CaCO3 (9) Final mass of bottle + CaCO3 (9) Molar mass of CaCO3 (g/mol) Purity of CaCO3 (%) Total volume of CaCO3 solution (ml) 35.3353 + 0.00013 35.1083 + 0.00013 100.087 + 0.002 99.90 + 0.05 250.00 +0.05 Standardization of EDTA Volume of Ca solution titrated (ml) Initial burette reading (ml) Final burette reading (mL) 25.00 + 0.02 2.25 +0.02 44.89 + 0.02 Analysis of water sample Volume of water sample titrated (ml) Initial burette reading (ml) Final burette reading (ml) 80.00 + 0.10 0.55 + 0.02 23.77 + 0.02