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
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.
LiOH • H2O
Formula Wt 41.96
CAS No. 1310-66-3
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
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥98.0% LiOH · H2O Maximum Allowable Lithium carbonate . . . . . . . . . . . . . . . . . . . . 2.0% Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.01% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.01% Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.05% Heavy metals (by ICP–OES) . . . . . . . . . . . . . . 0.002% Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002%
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4196 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
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.
Calculate the carbonate content using B mL. One milliliter of 0.1 N hydrochloric acid corresponds to 0.007389 g of Li2CO3.
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.
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
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DOI:10.1021/acsreagents.4196 ACS Reagent Chemicals, Part 4
