Monograph
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pubs.acs.org/doi/book/10.1021/acsreagents
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Cupric Oxide, Powdered
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Portions of this monograph have been updated. Please visit http://pubs.acs.org/doi/full/10.1021/acsreagents.4106 for a summary of changes.
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ABSTRACT
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This monograph for Cupric Oxide, Powdered 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 in Dilute Hydrochloric Acid, Carbon Compounds, Chloride, Nitrogen Compounds, Sulfate, Calcium, Iron, Potassium, and Sodium.
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CuO
Formula Wt 79.55
CAS No.1317-38-0
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CuO
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SUPPLEMENTS & UPDATES
28 Feb 2017
01 Jun 2016
Expired
Type
Summary
03 Jun 2019
Original
First on-line publication, based on 11th ed.
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Authoritative
Other Versions
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Published
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GENERAL DESCRIPTION . . . .
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black or brownish-black powder source for oxygen melting point, 1026 °C insoluble
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Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
SPECIFICATIONS
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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
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(Copper(II) Oxide)
Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.0% CuO
© 2017 American Chemical Society
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ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4106.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
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Maximum Allowable 0.02% 0.01% 0.005% 0.002% 0.02% 0.01% 0.05% 0.02% 0.05%
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Insoluble in dilute hydrochloric acid Carbon compounds (as C) . . . . . . . Chloride (Cl) . . . . . . . . . . . . . . . Nitrogen compounds (as N) . . . . . . Sulfate (SO4) . . . . . . . . . . . . . . . Calcium (Ca) . . . . . . . . . . . . . . . Iron (Fe) . . . . . . . . . . . . . . . . . . Potassium (K) . . . . . . . . . . . . . . . Sodium (Na) . . . . . . . . . . . . . . . .
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pubs.acs.org/doi/book/10.1021/acsreagents
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TESTS
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Assay
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(By complexometric titration of copper). Weigh, to the nearest 0.1 mg, 0.2 g of sample. Dissolve in a mixture of 20 mL of water and 5 mL of nitric acid, and boil for a few minutes to dissolve the sample completely. Cool, dilute with 50 mL of water in a 400 mL beaker, and add 50 mL of alcohol and 50.0 mL of 0.1 M EDTA volumetric solution. Then adjust the pH to about 5 (using a pH meter) with ammonium acetate–acetic acid buffer solution, add 0.2 mL of PAN indicator solution, and titrate with 0.1 M cupric sulfate volumetric solution while maintaining the pH at 5 by the addition of more buffer during the titration. The color change is from green to deep blue. Run a complete blank. One milliliter of 0.1 M EDTA corresponds to 0.007955 of CuO.
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{[mL (sample) − mL (blank)] × M EDTA} × 7.955 Sample wt (g)
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% CuO =
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Insoluble in Dilute Hydrochloric Acid
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Dissolve 5.0 g by warming on a hot plate (~100 °C) with 30 mL of dilute hydrochloric acid (2:1). Dilute with about 100 mL of water, heat to boiling, and digest in a covered beaker on a hot plate (~100 °C) for 1 h. Filter through a tared filtering crucible, wash thoroughly, and dry at 105 °C.
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Carbon Compounds
Chloride
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Ignite 1.2 g in a stream of carbon dioxide-free air or oxygen, and pass the effluent gases into 20 mL of 2.5% ammonium hydroxide reagent solution plus 2 mL of water. Prepare a standard of 20 mL of the 2.5% ammonium hydroxide and 1.06 mg of sodium carbonate (0.12 mg of C). Add 2 mL of 12% barium chloride reagent solution to each, and compare promptly. Any turbidity in the solution of the sample should not exceed that in the standard.
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For the sample solution, shake 1.0 g with 25 mL of dilute nitric acid (1:3) for 10 min, filter through a chloride-free filter, and dilute with water to 50 mL. To 10 mL of the sample solution, add 5 mL of water and 1 mL of silver nitrate reagent solution. Any turbidity should not exceed that produced by 0.01 mg of chloride ion (Cl) in an equal volume of solution containing 1 mL of nitric acid and 1 mL of silver nitrate reagent solution. The comparison is best made by the general method for chloride in colored solutions, [Part 2: Colorimetry and Turbidimetry; Chloride].
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4106.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
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pubs.acs.org/doi/book/10.1021/acsreagents
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Nitrogen Compounds
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[Part 2: Colorimetry and Turbidimetry; Nitrogen Compounds: Test for Ammonia, Amines, and Nitrogen Compounds Reduced by Aluminum]. Use 3.0 g suspended in 30 mL of freshly boiled 10% sodium hydroxide. For the standard, use 0.06 mg of nitrogen.
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Sulfate
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[Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 2]. Use 1.5 mL of dilute aqua regia (1 volume nitric acid + 4 volumes hydrochloric acid + 6 volumes water). Allow 30 min for turbidity to form.
Calcium, Iron, Potassium, and Sodium
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For the Determination of Calcium, Iron, Potassium, and Sodium
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(By flame AAS, [Part 2: Trace and Ultratrace Elemental Analysis; Atomic Absorption Spectroscopy; Analysis; Procedure for Flame AAS]).
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S a m p l e S t o c k S o l u t i o n A . Dissolve 4.0 g of sample by heating with 30 mL of dilute hydrochloric acid (2:1). Cool to room temperature, transfer to a 100 mL volumetric flask, and dilute to the mark with water (1 mL = 0.04 g).
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S a m p l e S t o c k S o l u t i o n B . Dilute 10.0 mL of sample stock solution A with water to 50 mL in a volumetric flask (1 mL = 0.008 g).
Element
Wavelength (nm)
Sample Wt (g)
Flame Type*
Background Correction
Ca
422.7
0.40
0.02; 0.04
N/A
No
Fe
248.3
0.40
0.10; 0.20
A/A
Yes
K
766.5
Na
589.0
0.20
0.02; 0.04
A/A
No
0.04
0.01; 0.02
A/A
No
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Standard Added (mg)
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For the Determination of Calcium, Iron, Potassium, and Sodium
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*A/A is air/acetylene; N/A is nitrous oxide/acetylene.
© 2017 American Chemical Society
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ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4106.20160601 ACS Reagent Chemicals, Part 4
