Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Formamide 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 Formamide provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), aqueous solubility, and density. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Freezing Point, and Color (APHA).
HCONH2
Formula Wt 45.04
CAS No. 75-12-7
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . . Density . . . . . . . . . . . . . . . .
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slightly viscous, clear, colorless liquid ionizing agent boiling point, 210 °C miscible 1.13
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.5% HCONH2 Freezing point . . . . . . . . . . . . . . . . . . . . . . 2.0–3.0 °C Maximum Allowable Color (APHA) . . . . . . . . . . . . . . . . . . . . . . . 10
TESTS Assay Analyze the sample by gas chromatography using the general parameters cited in [Part 2: Chromatography; Recommended Procedures; Gas Chromatography]. The following specific conditions are also required.
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4148 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Column . . . . . . . . . . . . . . . . . . . . . . . . . . Type I, methyl silicone Measure the area under all peaks, and calculate the formamide content in area percent.
Freezing Point Place 15 mL in a test tube (20 mm × 150 mm) in which is centered an accurate thermometer. The sample tube is centered by corks in an outer tube about 38 mm × 200 mm. Cool the whole apparatus, without stirring, in a bath of shaved or crushed ice with enough water to wet the outer tube. When the temperature is about 0 °C, stir to start the freezing, and read the thermometer every 30 s. The temperature that remains constant for 1–2 min is the freezing point.
Color (APHA) [Part 2: Measurement of Physical Properties; Color (APHA); Procedure for Color (APHA)].
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4148 ACS Reagent Chemicals, Part 4
