EDTA Titration Question: A 24-hour urine specimen was diluted to 2.000 L. After the solution was...
A 24-hr urine specimen was diluted to exactly 2.000 L in a volumetric flask. The Ca^2+ and Mg^2+ in a 100.0-mL aliquot of the diluted solution required 20.81 mL of 0.00830 M EDTA, after being buffered to a pH of 10.0. The Ca^2+ second 100.0-mL aliquot was precipitated as CaC_2O_4(s), which was filtered and washed. The filtrate and washings were titrated with 5.98 mL of the EDTA solution. Calculate the milligrams of Ca^2+ and Mg^2+ in the 24-hr sample.
Water Hardness by EDTA Titration Objective: To determine [Ca2+,MG2+] and [Mg2+] concentration in an unknown water sample A 0.0107 molarity solution of EDTA is prepared for the experiment. 25 mL of an unknown is pipetted and diluted 100 mL with distilled water and adjusted to a pH between 8 and 10 with NH4OH. A 10.00 mL portion of the diluted unknown is transferred to a 250 mL flask with 3 mL of pH 10 ammonia buffer and tiny amount of...