Boric Acid (H3BO3)

Boric Acid (General Use)

From: £13.88

From: £13.88

From: £13.88

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Why Buy Boric Acid (H3BO3) Online from UK Chemical Suppliers, ReAgent Chemicals?

We supply boric acid (H3BO3) in 500g containers or 25kg bags, but we can also offer specific pack sizes or different grades available to suit your needs. Discounts may be available when purchasing over 4 items – contact us to find out more. All our products come with 100% quality guarantee and are usually shipped within 24 hours.

About boric acid

Also known as hydrogen borate or boracic acid, boric acid is a weak acid of boron with the formula H3BO3 (this is sometimes written as B(OH)3to highlight its acidic properties). These colourless crystals easily dissolve in water and are used in many industrial applications, including in the manufacture of flame retardant or insecticide.

Natural occurrence

In natural conditions, boric acid is a component of a mineral called sassolite, with a distribution near volcanoes, such as Tuscany, Italy or the Lipari islands, Nevada, US. It is also found mixed with other compounds in boracite, boronatrocaicite or colemanite. Boric acid is a predominant salt in salt water, as well as ubiquitous in many plants.


Boric acid can be synthesised by two main processes:
  1. Via a reaction between sodium tetraborate decahydrate (Na2B4O7·10H2O, also known as borax) and hydrochloric acid (HCl):Na2B4O7·10H2O + 2 HCl → 4 H3BO3 + 2 NaCl + 5 H2O
  2. Alternatively, it can also be a by-product of hydrolysis of diborane (B2H6) or boron trihalides (BX3, where X can be Bromium, Iodine or Chloride):B2H6 + 6 H2O → 6H2 + 2 B(OH)3 BX3 + 3 H2O → 3HX + B(OH)3

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