Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Chlorobenzene (Monochlorobenzene) 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 Chlorobenzene 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, Color (APHA), Residue after Evaporation, and Titrable Acid.
C6H5Cl
Formula Wt 112.56
CAS No. 108-90-7
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . . Density . . . . . . . . . . . . . . . .
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clear liquid solvent boiling point, 132 °C 0.05 g in 100 mL at 20 °C 1.11
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.5% C6H5Cl Maximum Allowable Color (APHA) . . . . . . . . . . . . . . . . . . . . . . . 30 Residue after evaporation . . . . . . . . . . . . . . . 0.02% Titrable acid . . . . . . . . . . . . . . . . . . . . . . . 0.004 meq/g
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4090 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
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. Column . . . . . . . . . . . . . . . . . . . . . . . . . . Type I, methyl silicone Measure the area under all peaks, and calculate the chlorobenzene content in area percent.
Color (APHA) [Part 2: Measurement of Physical Properties; Color (APHA); Procedure for Color (APHA)].
Residue after Evaporation [Part 2: Gravimetric Methods; Residue after Evaporation]. Evaporate 20 g (18 mL) in a tared, preconditioned dish on a hot plate (~100 °C), and dry the residue at 105 °C for 30 min.
Titrable Acid Neutralize 200 mL of methanol to a methyl red end point with 0.1 N sodium hydroxide. Add 25 g (23 mL) of sample, and titrate with 0.1 N sodium hydroxide to the same methyl red end point. Not more than 1.0 mL should be required.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4090 ACS Reagent Chemicals, Part 4
