Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Soda Lime 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 Soda Lime provides, in addition to common physical constants, a general description including typical appearance and applications. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Carbon Dioxide Absorption Capacity, Loss on Drying, and Fines.
CAS No. 8006-28-8
Note: Soda lime is a mixture of variable proportions of sodium hydroxide with calcium oxide or hydroxide. This reagent may or may not include an indicator.
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . white or gray-white solid Applications . . . . . . . . . . . . . . . . . . . . . . . . to absorb carbon dioxide
SPECIFICATIONS Carbon dioxide absorption capacity . . . . . . . . . ≥19.0% Maximum Allowable Loss on drying . . . . . . . . . . . . . . . . . . . . . . 7% Fines . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1%
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4324 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Carbon Dioxide Absorption Capacity Fill the lower transverse section of a U-shaped drying tube of about 15 mm internal diameter and 15 cm height with loosely packed glass wool. Place in one arm of the tube about 5 g of anhydrous calcium chloride, and accurately weigh the tube, and its contents. Into the other arm of the tube place 9.5–10.5 g of soda lime, and again weigh accurately. Insert stoppers in the open arms of the U-tube, and connect the side tube of the arm filled with soda lime to a calcium chloride drying tube, which in turn is connected to a suitable source of carbon dioxide. Pass the carbon dioxide though the U-tube at a rate of 75 mL/min for 30 min, accurately timed. Disconnect the U-tube, cool to room temperature, remove the stoppers, and weigh.
Loss on Drying Weigh accurately about 10 g, and dry in a preconditioned crucible at 200 °C for 18 h.
Fines Place 100 g on a clean U.S. No. 100 standard sieve nested in a receiving pan. Cover the sieve, and shake on a mechanical shaker for 5 min. The weight of the fine material in the receiving pan should not exceed 1.0 g.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4324 ACS Reagent Chemicals, Part 4
