Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Cuprous Chloride (Copper(I) Chloride) 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 Cuprous Chloride 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 Acid, Sulfate, Calcium, Iron, Potassium, and Sodium.
CuCl
Formula Wt 99.00
CAS No. 7758-89-6
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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white crystalline solid; may oxidize to green in air absorption of carbon monoxide in gas analysis melting point, 430 °C 1.52 g in 100 mL at 25 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥90.0% CuCl
Insoluble in acid Sulfate (SO4) . . Calcium (Ca) . . Iron (Fe) . . . . . Potassium (K) . . Sodium (Na) . . .
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© 2017 American Chemical Society
Maximum Allowable 0.02% 0.1% 0.01% 0.005% 0.02% 0.05%
A
DOI:10.1021/acsreagents.4109 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By iodometric titration of reductive capacity of CuI). Weigh accurately 0.4 g and dissolve in the cold in 30 mL of ferric ammonium sulfate solution (10.0 g of ferric ammonium sulfate dissolved in 100 mL of 20% hydrochloric acid reagent solution). Add 5 mL of phosphoric acid, dilute with 200 mL of water, and titrate with 0.1 N potassium permanganate. The solution should be prepared and titrated in a flask in which the air is replaced with carbon dioxide. A stream of carbon dioxide should be passed through the flask during the titration. One milliliter of 0.1 N permanganate corresponds to 0.009900 g of CuCl.
Insoluble in Acid Heat 5.0 g with 50 mL of dilute hydrochloric acid (1:1), and add nitric acid in small portions until the sample is dissolved. Dilute with 50 mL of water. If insoluble matter is present, filter through a tared filtering crucible, wash thoroughly, and dry at 105 °C. Retain the filtrate and washings for the test for sulfate.
Sulfate [Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 1]. Dilute the combined filtrate and washings from the test for insoluble in acid with water to 200 mL. Use 2 mL of this solution. Allow 30 min for turbidity to form.
Calcium, Iron, 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, Potassium, and Sodium
S a m p l e S t o c k S o l u t i o n . To 10.0 g of sample, add 45 mL of dilute hydrochloric acid (1:1), and heat on a hot plate (~100 °C). Cautiously add 5 mL of nitric acid, and keep warming and stirring until dissolved. Cool to room temperature, transfer to a 100 mL volumetric flask, and dilute to the mark with water (1 mL = 0.10 g).
For the Determination of Calcium, Iron, Potassium, and Sodium
Element
Wavelength (nm)
Sample Wt (g)
Standard Added (mg)
Flame Type*
Background Correction
Ca
422.7
0.20
0.02; 0.04
N/A
No
Fe
248.3
1.0
0.05; 0.10
A/A
Yes
K
766.5
0.20
0.02; 0.04
A/A
No
Na
589.0
0.02
0.005; 0.01
A/A
No
*A/A is air/acetylene; N/A is nitrous oxide/acetylene.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4109 ACS Reagent Chemicals, Part 4
