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Toggle the table of contents. Boric acid (data page) Add languages. Add links ... This page provides supplementary chemical data on boric acid. Thermodynamic ...
Boric acid is a weak acid, with pK a (the pH at which buffering is strongest because the free acid and borate ion are in equal concentrations) of 9.24 in pure water at 25 °C. But apparent p K a is substantially lower in swimming pool or ocean waters because of interactions with various other molecules in solution.
Potassium fluoroborate is obtained by treating potassium carbonate with boric acid and hydrofluoric acid. B(OH) 3 + 4 HF → HBF 4 + 3 H 2 O 2 HBF 4 + K 2 CO 3 → 2 KBF 4 + H 2 CO 3. Fluoroborates of alkali metals and ammonium ions crystallize as water-soluble hydrates with the exception of potassium, rubidium, and cesium.
Tetrahydroxyborate is an inorganic anion with the chemical formula [BH 4 O 4] − or [B(OH) 4] −.It contributes no colour to tetrahydroxyborate salts. It is found in the mineral hexahydroborite, Ca(B(OH) 4) 2 · 2 H 2 O, originally formulated CaB 2 O 4 · 6 H 2 O. [2]
The hydrated tetraborate anion occurs in the mineral borax (sodium tetraborate octahydrate) with the formula Na 2 [B 4 O 5 (OH) 4]·8H 2 O. The borax chemical formula is also commonly written in a more compact notation as Na 2 B 4 O 7 ·10H 2 O. Sodium borate can be obtained in high purity and so can be used to make a standard solution in ...
Tetraboric acid or pyroboric acid is a chemical compound with empirical formula H 2 B 4 O 7. [2] It is a colourless water-soluble solid formed by the dehydration or polymerization boric acid . Tetraboric acid is formally the parent acid of the tetraborate anion [B 4 O 7 ] 2− .
The following is a sample recipe for BBS: 10 mM Sodium borate; 150 mM NaCl; Adjust pH to pH 8.2 The simplest way to prepare a BBS solution is to use BBS tablets.
It consists of a mixture of 0.04 M boric acid, 0.04 M phosphoric acid and 0.04 M acetic acid that has been titrated to the desired pH with 0.2 M sodium hydroxide. Britton and Robinson also proposed a second formulation that gave an essentially linear pH response to added alkali from pH 2.5 to pH 9.2 (and buffers to pH 12).