Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Diphenylamine (N-Phenylbenzeneamine) 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 Diphenylamine provides, in addition to common physical constants, a general description including typical appearance, applications, aqueous solubility, and pKa. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Melting Point, Sensitivity to Nitrate, Solubility in Alcohol, Residue after Ignition, and Nitrate.
(C6H5)2NH
Formula Wt 169.23
CAS No. 122-39-4
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . white or almost white solid, darkening on exposure to light Applications . . . . . . . . . . . . . . . . . . . . . . . . detection of nitrate, chlorate, and other oxidizers; indicator for redox titrations Aqueous solubility . . . . . . . . . . . . . . . . . . . . 0.03 g in 100 mL at 25 °C pKa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9
SPECIFICATIONS Melting point . . . . . . . . . . . . . . . . . . . . . . . 52.5–54.0 °C Sensitivity to nitrate . . . . . . . . . . . . . . . . . . Passes test Maximum Allowable Solubility in alcohol . . . . . . . . . . . . . . . . . . . Passes test Residue after ignition. . . . . . . . . . . . . . . . . . 0.03% Nitrate (NO3) . . . . . . . . . . . . . . . . . . . . . . . Passes test
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4126 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Melting Point [Part 2: Measurement of Physical Properties; Melting Point].
Sensitivity to Nitrate To 8 mL of the solution retained from the test for nitrate, add 0.01 mg of nitrate ion (NO3) and allow to stand at 60 °C for 5 min. A blue color should be produced.
Solubility in Alcohol Dissolve 1.0 g in 50 mL of alcohol. The solution should be clear and colorless.
Residue after Ignition [Part 2: Gravimetric Methods; Residue after Ignition]. Ignite 4.0 g. Moisten the char with 2 mL of sulfuric acid.
Nitrate To 20 mL of water, add 60 mL of nitrate-free sulfuric acid, adjust the temperature to about 60 °C, and add 0.5 mL of hydrochloric acid and 0.0100 g of the sample. No blue color should be produced in 5 min. Retain the solution for the test for sensitivity to nitrate.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4126 ACS Reagent Chemicals, Part 4
