1. Calcium in a 200 uL serum sample is titrated with 1.87 x 10^-4M EDTA solution, requiring 2.47 mL. What is the calcium concentration in the blood in mg/dL?
2. A 0.250 g sample of impure AlCl3 is titrated with 0.100 M AgNO3, requiring 48.6 mL. What volume of 0.100 M EDTA would react with a 0.350 g sample? (EDTA reacts with Al3+ in a 1:1 ratio.)
3. The purity of a 0.287 g sample of Zn(OH)2 is determined by titrating with a standard HCl solution, requiring 37.8 mL. The HCl solution was standardized by precipitating AgCl in a 25.0 mL aliquot and weighing (0.462 g AgCl obtained). What is the purity of the Zn(OH)2?
