Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Sodium Periodate (Sodium Metaperiodate; Sodium Tetraoxoiodate(VII))
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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 Sodium Periodate 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, Other Halogens, and Manganese.
NaIO4
Formula Wt 213.89
CAS No. 7790-28-5
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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white solid oxidimetric standard; determination of manganese decomposes at 300 °C 37 g in 100 mL at 50 °C
SPECIFICATIONS Assay (dried basis). . . . . . . . . . . . . . . . . . . . 99.8–100.3% NaIO4
Maximum Allowable Other halogens (as Cl) . . . . . . . . . . . . . . . . . 0.02% Manganese (Mn) . . . . . . . . . . . . . . . . . . . . . 3 ppm
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4361 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay
Downloaded by CORNELL UNIV on May 13, 2017 | http://pubs.acs.org Publication Date (Web): February 28, 2017 | doi: 10.1021/acsreagents.4361
(By indirect titration of reductive capacity). Dry a sample over phosphorus pentoxide or magnesium perchlorate desicant for 6 h. Weigh accurately about 1 g, dissolve in water, and transfer to a 500 mL volumetric flask. Dilute to volume with water, and mix thoroughly. Place a 50.0 mL aliquot of this solution in a glass-stoppered flask, and add 10 g of potassium iodide and 10 mL of a cooled solution of sulfuric acid (1:5). Stopper, swirl, allow to stand for 5 min, and add 100 mL of cold water. Titrate the liberated iodine with 0.1 N sodium thiosulfate volumetric solution, adding 3 mL of starch indicator solution near the end of the titration. Correct for a complete blank. One milliliter of 0.1 N sodium thiosulfate corresponds to 0.002674 g of NaIO4.
Other Halogens Dissolve 0.50 g in 25 mL of a dilute solution of sulfurous acid (3:2). Boil for 3 min, cool, and add 5 mL of ammonium hydroxide and 20 mL of 2.5% silver nitrate solution. Allow the precipitate to coagulate, filter through a chloride-free filter, and dilute the filtrate with water to 200 mL. To 20 mL of this solution, add 1.5 mL of nitric acid. Any turbidity should not exceed that produced by 0.01 mg of chloride ion (C l) in an equal volume of solution containing 0.5 mL of ammonium hydroxide, 1.5 mL of nitric acid, and 1 mL of silver nitrate reagent solution.
Manganese Dissolve 2.5 g in 40 mL of 10% sulfuric acid reagent solution. For the control, add 0.5 g of the sample and 0.006 mg of manganese to 40 mL of 10% sulfuric acid reagent solution. Add 5 mL of nitric acid and 5 mL of phosphoric acid to each, boil gently for 10 min, and cool. Any pink color in the solution of the sample should not exceed that in the control.
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4361 ACS Reagent Chemicals, Part 4
