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
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A u t h o r i t a t i v e V e r s i o n : This version is current as of 01 Jun 2016.
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.
O O Cl OO
Mg2+
Mg(ClO4)2
2
Formula Wt 223.20
CAS No. 10034-81-8
SUPPLEMENTS & UPDATES Published
Authoritative
28 Feb 2017
01 Jun 2016
Expired
Type
Summary
Other Versions
Original
First on-line publication, based on 11th ed.
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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© 2017 American Chemical Society
very hygroscopic white solid drying agent decomposes above 250 °C 99 g in 100 mL at 25 °C
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4206.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
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%
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
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4206.20160601 ACS Reagent Chemicals, Part 4
