Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Lithium Hydroxide Monohydrate 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 Lithium Hydroxide Monohydrate provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Lithium Carbonate, Insoluble Matter, Chloride, Sulfate, Heavy Metals, and Iron.
H2O
LiOH
LiOH·H2O
Formula Wt 41.96
CAS No. 1310-66-3
SUPPLEMENTS & UPDATES Published
Authoritative
28 Feb 2017
01 Jun 2016
Expired
Type
Summary
Original
First on-line publication, based on 11th ed.
Other Versions
Note: The formula weight of this reagent is likely to deviate from the value cited because the natural distribution of 6 Li and 7Li is often altered in current sources of lithium compounds.
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . white solid Applications . . . . . . . . . . . . . . . . . . . . . . . . catalyst for alkyd resins Aqueous solubility . . . . . . . . . . . . . . . . . . . . 26.8 g in 100 mL at 80 °C
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4196.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥98.0% LiOH·H2O
Lithium carbonate . . . . . . Insoluble matter . . . . . . . Chloride (Cl) . . . . . . . . . Sulfate (SO4) . . . . . . . . . Heavy metals (by ICP–OES) Iron (Fe) . . . . . . . . . . . .
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Maximum Allowable 2.0% 0.01% 0.01% 0.05% 0.002% 0.002%
TESTS Assay and Lithium Carbonate (By acidimetry). Weigh accurately about 1.6 g, and dissolve in 50 mL of carbon dioxide-free water. Add 5 mL of 12% barium chloride reagent solution, stopper, and allow to stand for five min. Add 0.15 mL of phenolphthalein indicator solution, and titrate with 1 N hydrochloric acid volumetric solution just to a colorless end point (A mL). Add 0.15 mL of bromphenol blue indicator solution, and titrate with 0.1 N hydrochloric acid to a yellow end point (B mL). Calculate the assay using (A – 0.1 B) mL. One milliliter of 1 N hydrochloric acid corresponds to 0.04196 g of LiOH · H2O.
% LiOH · H 2O =
[(A
0.1B) mL × N HCl)] × 4.196 Sample wt (g)
Calculate the carbonate content using B mL. One milliliter of 0.1 N hydrochloric acid corresponds to 0.007389 g of Li2CO3.
% Li 2CO3 =
(B mL × N HCl) × 7.389 Sample wt (g)
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 10.0 g in 100 mL of water. Do not boil the sample.
Chloride [Part 2: Colorimetry and Turbidimetry; Chloride]. Use 0.1 g.
Sulfate [Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 1]. Use 0.10 g, and add hydrochloric acid (1:1) until just acid. Then proceed as directed in the general procedure. For the standard, add the same amount of hydrochloric acid (1:1) as used for the sample.
Heavy Metals ([Part 2: Trace and Ultratrace Elemental Analysis; Inductively Coupled Plasma−Optical Emission Spectroscopy (ICP–OES); Calculation of Heavy Metals (by ICP–OES) Results], by ICP–OES). Use 0.5 g sample.
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4196.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Iron [Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 1 (Ammonium Thiocyanate)]. Use 0.5 g in 10 mL of water, add 3 mL of hydrochloric acid, and dilute to 40 mL.
© 2017 American Chemical Society
C
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4196.20160601 ACS Reagent Chemicals, Part 4
