Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Eosin Y (2′,4′,5′,7′-Tetrabromofluorescein, Disodium Salt) 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 Eosin Y provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Clarity of Aqueous Solution and Suitability as Adsorption Indicator.
C20H6Br4Na2O5
Formula Wt 691.00
CAS No. 17372-87-1
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . red solid with a bluish tinge or brownish-red solid Applications . . . . . . . . . . . . . . . . . . . . . . . . indicator for argentimetric titrations Aqueous solubility . . . . . . . . . . . . . . . . . . . . freely soluble
SPECIFICATIONS Clarity of aqueous solution . . . . . . . . . . . . . . Passes test Suitability as adsorption indicator . . . . . . . . . . Passes test
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4132 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Clarity of Aqueous Solution Dissolve 0.05 g in 100 mL of water. The solution should be clear and complete. Reserve the solution for the suitability test.
Suitability as Adsorption Indicator Prepare a 0.10 N solution of sodium chloride by dissolving 0.58 g of sodium chloride in water, and dilute to 100.0 mL. Dilute 10.0 mL of the 0.10 N sodium chloride with 30.0 mL of methanol and 10.0 mL of acetic acid. Add 0.15 mL of the solution reserved from the preceding test, and with vigorous stirring, titrate with 0.1 N silver nitrate volumetric solution, protecting the titration vessel from direct sunlight. The color change from orange to bright pink should require between 9.9 and 10.1 mL of the silver nitrate solution.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4132 ACS Reagent Chemicals, Part 4
