Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Magnesium Perchlorate, Desiccant 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 Magnesium Perchlorate, Desiccant 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: Suitability for Moisture Absorption, Titrable Free Acid, Titrable Base, and Loss on Drying. Special caution is advised for the handling or testing of this substance.
Mg(ClO4)2
Formula Wt 223.20
CAS No. 10034-81-8
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
very hygroscopic white solid drying agent decomposes above 250 °C 99 g in 100 mL at 25 °C
SPECIFICATIONS Suitability for moisture absorption . . . . . . . . . Passes test Maximum Allowable Titrable free acid . . . . . . . . . . . . . . . . . . . . 0.005 meq/g Titrable base . . . . . . . . . . . . . . . . . . . . . . . 0.025 meq/g Loss on drying . . . . . . . . . . . . . . . . . . . . . . 8%
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4206 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Suitability for Moisture Absorption Weigh about 2 g in a tared, 50 mL weighing bottle having a diameter of 50 mm and a height of 30 mm. Place the bottle, with cover removed, for at least 16 h in a closed container in which the atmosphere possesses a relative humidity of 85%, maintained by equilibrium with sulfuric acid having a specific gravity of 1.16. The increase in weight should not be less than 25%.
Titrable Free Acid and Titrable Base Dissolve 2.0 g in 25 mL of water, and add 0.15 mL of methyl orange indicator solution. Any red color produced should be changed to yellow by the addition of not more than 1.0 mL of 0.01 N sodium hydroxide (titrable free acid). If a yellow color is produced, not more than 5.0 mL of 0.01 N hydrochloric acid should be required to produce a red color (titrable base).
Loss on Drying
C a u t i o n : Do not dry the sample in the presence of any organic material.
Weigh accurately about 1 g, and dry at 190 ± 10 °C to constant weight. Calculate the loss in weight as percent water.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4206 ACS Reagent Chemicals, Part 4
