Lithium Hydroxide
| CAS No.: |
1310-66-3 |
| Molecular Weight: |
23.95 g/mol |
| Chemical Formula |
LiOH |
Lithium hydroxide monohydrate or anhydrous is an inorganic compound with the formula LiOH or LiOH-H2O. It is a white hygroscopic crystalline material. It is soluble in water and slightly soluble in ethanol and is available commercially in anhydrous form and as the monohydrate which is more common. It is used in alkaline storage batteries and in preparation of other lithium salts. Used as a catalyst in the production of alkyd resins in esterifications. Also, used in the production of lithium soaps, sulfonates and greases.
General Properties and Specifications of Lithium Hydroxide Monohydrate and Anhydrous:
CAS Number: 1310-66-3 monohydrate or 1310-65-2 anhydrous.
Appearance: White Crystalline Powder. Hygroscopic.
Odor: Odorless.
LiOH: 57% to 99% as required by the buyer.
Na+K: 0.2% maximum.
Fe2O3: 0.003% maximum.
CaO: 0.035% maximum.
SO4: 0.03% maximum.
Cl: 0.02% maximum.
CO2: 0.5% maximum.
Matter insoluble in HCl: 0.01% maximum.
Relative density: around 1.46 for anhydrous and around 1.51 for monohydrate
Melting point: 462C.
Boiling point: 924C.
Solubility: Soluble in water. Slightly soluble in ethanol.
Specifications of Lithium Hydroxide USP Grade Specifications:
LiOH-H2O --- 41.96
LiOH --- 23.95
Lithium hydroxide monohydrate CAS 1310-66-3.
Lithium hydroxide Anhydrous CAS 1310-65-2.
DEFINITION
Lithium Hydroxide contains NLT 98.0% and NMT 102.0% of lithium hydroxide (LiOH), calculated on the anhydrous basis.
IDENTIFICATION
A. When moistened with hydrochloric acid, it imparts an intense crimson color to a nonluminous flame.
Chloride and Sulfate, Sulfate:
Sample: 2.0 g
Acceptance criteria: It shows no more sulfate than corresponds to 1.0 mL of 0.020 N sulfuric acid (0.05%).
Calcium:
Sample solution: Dissolve 3.33 g in 50 mL of 3 N hydrochloric acid. Boil the clear solution to expel carbon dioxide, add 5 mL of ammonium oxalate, render alkaline with 6 N ammonium hydroxide, and allow to stand for 4 h. Pass through a filtering crucible, and wash with warm water until the last washing yields no turbidity with calcium chloride. Place the crucible in a beaker, cover it with water, add 3 mL of sulfuric acid, and heat to 70C.
Analysis: Titrate the Sample solution with 0.10 N potassium permanganate to a pale pink color that persists for 30 s.
Acceptance criteria: NMT 3.34 mL of 0.10 N potassium permanganate is consumed (0.20%).
Carbonate:
[Note: While pipeting and during the subsequent titrations, keep the contents of the flasks blanketed with a stream of carbon dioxide-free air.]
Analysis: To the flask containing the completed Final titration obtained in the Assay, add 1 drop of methyl orange TS. Titrate with 0.1 N hydrochloric acid VS until a persistent orange color is produced and no undissolved barium carbonate remains. Perform a blank titration to determine the volume of 0.1 N hydrochloric acid consumed in going from the phenolphthalein endpoint to the methyl orange endpoint. To 100 mL of carbon dioxide-free water in a 250-mL conical flask, add 3 drops of the Sample solution from the Assay, 20 mL of 1 N barium chloride, and 3 drops of phenolphthalein TS. Allow to stand for 2 min. Titrate this solution with 0.1 N hydrochloric acid. At the discharge of the pink color of the indicator, add 1 drop of methyl orange TS, and titrate with 0.1 N hydrochloric acid VS until a persistent orange color is produced.
Acceptance criteria: The titration shows no more carbon dioxide than corresponds to 1.5 mL of 0.10 N hydrochloric acid (0.7%).
Lithium Content: To pass the test by Flame photometry.
Acceptance criteria: 28.1%–29.9% on the anhydrous basis.
Water Determination:
Analysis: Dry at 135C at a pressure of NMT 5 mm of mercury for 1 h.
Acceptance criteria: 41.0%–43.5%
Packaging and Storage: Preserve in tight containers.
