Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Cupric Acetate Monohydrate (Copper(II) Acetate Monohydrate)
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Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for Cupric Acetate Monohydrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Insoluble Matter, Chloride, Sulfate, Calcium, Iron, Nickel, Potassium, and Sodium.
(CH3COO)2Cu · H2O
Formula Wt 199.65
CAS No. 6046-93-1
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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blue-green or dark green solid preparation of Fehling’s reagent for sugars melting point, 115 °C 7.2 g in 100 mL at 20 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.0–102.0% (CH3COO)2Cu · H2O Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.01% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.003% Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.01% Calcium (Ca) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002% Nickel (Ni) . . . . . . . . . . . . . . . . . . . . . . . . . 0.01% Potassium (K) . . . . . . . . . . . . . . . . . . . . . . . 0.01% Sodium (Na) . . . . . . . . . . . . . . . . . . . . . . . . 0.05%
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4103 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By iodometric titration of oxidative capacity of CuII). Weigh accurately about 0.8 g, and dissolve in 50 mL of water. Add 4 mL of glacial acetic acid, 1 mL of 10% sulfuric acid, and 3 g of potassium iodide. Swirl. Titrate the liberated iodine with 0.1 N sodium thiosulfate, adding about 2 g of potassium thiocyanate and 3 mL of starch indicator solution near the end of the titration. One milliliter of 0.1 N sodium thiosulfate corresponds to 0.01996 g of (CH3COO)2Cu · H2O.
Downloaded by CORNELL UNIV on May 9, 2017 | http://pubs.acs.org Publication Date (Web): February 28, 2017 | doi: 10.1021/acsreagents.4103
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 10 g dissolved in 150 mL of water containing 5 mL of glacial acetic acid. Omit heating. Reserve the filtrate without washings for the sulfate test.
Chloride Dissolve 0.50 g in 15 mL of water, filter if necessary through a small chloride-free filter, and add 1 mL of nitric acid and 1 mL of silver nitrate reagent solution. Any turbidity should not exceed that produced by 0.015 mg of chloride ion (Cl) in an equal volume of solution containing the quantities of reagents used in the test. The comparison is best made by the general method for chloride in colored solutions, [Part 2: Colorimetry and Turbidimetry; Chloride].
Sulfate [Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 1]. Use 1/20 of the filtrate from the test for insoluble matter. Allow 30 min for turbidity to form.
Calcium, Iron, Nickel, Potassium, and Sodium (By flame AAS, [Part 2: Trace and Ultratrace Elemental Analysis; Atomic Absorption Spectroscopy; Analysis; Procedure for Flame AAS]).
For the Determination of Calcium, Iron, Nickel, Potassium, and Sodium
S a m p l e S t o c k S o l u t i o n A . Dissolve by warming 25.0 g of sample in a mixture of 60 mL of water and 15 mL of nitric acid. Cool to room temperature, transfer to a 100 mL volumetric flask, and dilute to the mark with water (1 mL = 0.25 g). S a m p l e S t o c k S o l u t i o n B . Dilute 4.0 mL of sample stock solution A with water to 100 mL in a volumetric flask (1 mL = 0.01 g).
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4103 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
For the Determination of Calcium, Iron, Nickel, Potassium, and Sodium
Element
Wavelength (nm)
Sample Wt (g)
Standard Added (mg)
Flame Type*
Background Correction
Ca
422.7
2.0
0.05; 0.10
N/A
No
Fe
248.3
5.0
0.05; 0.10
A/A
Yes
Ni
232.0
2.0
0.10; 0.20
A/A
Yes
K
766.5
0.20
0.02; 0.04
A/A
No
Na
589.0
0.04
0.01; 0.02
A/A
No
Downloaded by CORNELL UNIV on May 9, 2017 | http://pubs.acs.org Publication Date (Web): February 28, 2017 | doi: 10.1021/acsreagents.4103
*A/A is air/acetylene; N/A is nitrous oxide/acetylene.
© 2017 American Chemical Society
C
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4103 ACS Reagent Chemicals, Part 4
