ca gravimetric lab (1
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순서
레포트/기타
Gravimetric Determination of Calcium as CaC2O4.H2O
(Experiment 2)
Calcium ion can be analyzed by precipitation with oxalate in basic solution to form CaC2O4.H2O. The precipitate is soluble in acidic solution because the oxalate anion is a weak base. Large, easily filtered, relatively pure crystals of product will be obtained if the precipitation is carried out slowly. This can be done by dissolving Ca2+ and C2O42- in acidic solution and gradually raising the pH by thermal decomposition of urea (see Reaction 27-2 in the textbook).
UNKNOWN
You will be given about 150-mL of a solution containing ~ 0.1-0.2 M Ca2+. (The solution was prepared by dissolving solid CaCO3 or CaCl2 in dilute HCl.) The objective is to determine the exact molarity of the Ca2+ solution.
PROCEDURE
1. Dry three medium-porosity, sintered-glass funnels for 1 h at 105° C; cool them in a desiccator for 15 min (more if still warm) and weigh them on the analytical balance. Repeat the procedure with 15-min …(skip)
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