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Balance this equation and balanced reaction equation and the quantities included in the procedure to calculate the theoretical yield of K[Cr(C2O4)2(H2O)2]·2H2O.

Balance this equation and balanced reaction equation and the quantities included in the procedure to calculate the theoretical yield of K[Cr(C2O4)2(H2O)2]·2H2O.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter20: Chemistry Of Selected Transition Elements And Coordination Compounds
Section: Chapter Questions
Problem 53QRT: Give the charge on the central metal ion in each of these. (a) [VCl6]4 (b) [Sc(H2O)3Cl3] (c)...
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Balance this equation and balanced reaction equation and the quantities included in the procedure to calculate the theoretical yield of K[Cr(C2O4)2(H2O)2]·2H2O. 

_K2Cr,0, +_H,C204 ·2H20 → _K[Cr(C204)2(H20)2] · 2H20 + _CO2 +_H20
Transcribed Image Text:_K2Cr,0, +_H,C204 ·2H20 → _K[Cr(C204)2(H20)2] · 2H20 + _CO2 +_H20
Part 1 – Preparation of potassium dioxalatodiaquochromium(III) dihydrate i. Set up a steam bath by boiling 400 mL of water in a 600 mL beaker, adding a few boiling chips to the water to prevent it from bumping. ii. Wash and dry an evaporating dish and weigh it on an analytical balance. iii. Weigh out about 3 g of oxalic acid dihydrate (H2C2O4 2H2O) and 1 g of potassium dichromate (K2Cr2O7). In a fume hood, transfer the powders to a mortar and mix them thoroughly using the pestle. Transfer the mixture into the center of the pre-weighed evaporating dish. CAUTION: potassium dichromate is a potent carcinogen and should never be removed from the fume hood. iv. Measure out 20 mL of 95% ethanol in a 50 mL graduated cylinder and leave it to the side within reach. Add one drop of distilled water to the mixture, cover the evaporating dish with a watch glass, and place the evaporating dish on the steam bath. V. After a short time, a vigorous spontaneous reaction will set in and rapidly spread through the mixture, causing it to liquefy to a deeply coloured viscous liquid. Without waiting for the liquid to cool, pour 10 mL of ethanol over it, and while still warming the dish on the steam bath, gently stir the product with a glass rod. CAUTION: 95% ethanol (liquid and vapour) is highly flammable. vi. Decant the liquid into a waste beaker and replace it with another 10 mL of ethanol; warm and continue the stirring, repeating the decanting procedure as often as necessary until the product is entirely crystalline and granular (2-3 times is generally sufficient). vii. Dry the product by evaporating the remaining alcohol over the steam bath. Weigh the evaporating dish containing the product to determine the weight of the product by difference. viii. Transfer the product to a sample vial.
Transcribed Image Text:Part 1 – Preparation of potassium dioxalatodiaquochromium(III) dihydrate i. Set up a steam bath by boiling 400 mL of water in a 600 mL beaker, adding a few boiling chips to the water to prevent it from bumping. ii. Wash and dry an evaporating dish and weigh it on an analytical balance. iii. Weigh out about 3 g of oxalic acid dihydrate (H2C2O4 2H2O) and 1 g of potassium dichromate (K2Cr2O7). In a fume hood, transfer the powders to a mortar and mix them thoroughly using the pestle. Transfer the mixture into the center of the pre-weighed evaporating dish. CAUTION: potassium dichromate is a potent carcinogen and should never be removed from the fume hood. iv. Measure out 20 mL of 95% ethanol in a 50 mL graduated cylinder and leave it to the side within reach. Add one drop of distilled water to the mixture, cover the evaporating dish with a watch glass, and place the evaporating dish on the steam bath. V. After a short time, a vigorous spontaneous reaction will set in and rapidly spread through the mixture, causing it to liquefy to a deeply coloured viscous liquid. Without waiting for the liquid to cool, pour 10 mL of ethanol over it, and while still warming the dish on the steam bath, gently stir the product with a glass rod. CAUTION: 95% ethanol (liquid and vapour) is highly flammable. vi. Decant the liquid into a waste beaker and replace it with another 10 mL of ethanol; warm and continue the stirring, repeating the decanting procedure as often as necessary until the product is entirely crystalline and granular (2-3 times is generally sufficient). vii. Dry the product by evaporating the remaining alcohol over the steam bath. Weigh the evaporating dish containing the product to determine the weight of the product by difference. viii. Transfer the product to a sample vial.
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