What is Potassium metaborate

Submitted by admin on Thu, 01/03/2019 - 07:48

Potassium metaborate is white powder or white crystal with a molecular formula of K2B2O4.3H2O.

Name: Potassium metaborate
Alias: Boric acid (HBO2), potassium salt (1:1);
Boric acid (HBO2), potassium salt; boranolate, oxo-, potassium salt

Physical and chemical properties:
The Relative density 1.178 Solubility Soluble in water and slowly liberate hydrogen, slightly soluble in methanol and ethanol, almost insoluble in ether, benzene, tetrahydrofuran, methyl ether and other hydrocarbons.

Preparation method:
4H3BO3+2KOH ===K2B4O7 (potassium tetraborate) + 7H2O (insufficient KOH)
K2B4O7+ 2KOH=== 4KBO2 (potassium metaborate) + H2O (KOH excess)

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