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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.
[1] [2] [3] For comparison, normal circulating boron levels are 0.1 to 80 μg/mL, acute boric acid toxicity has been associated with levels of 5.4 to 1,000 μg/mL, concentrations of 80 to 126 μg/mL have been observed without toxicity symptoms or signs, and boric acid levels of less than 200 μg/mL are thought to be safe by many researchers.
Borax is also easily converted to boric acid and other borates, which have many applications. Its reaction with hydrochloric acid to form boric acid is: Na 2 B 4 O 7 ·10H 2 O + 2 HCl → 4 H 3 BO 3 + 2 NaCl + 5 H 2 O. Borax is sufficiently stable to find use as a primary standard for acid-base titrimetry. [17]: p.316
Sassolite is a borate mineral, specifically the mineral form of boric acid. It is usually white to gray, and colourless in transmitted light. It can also take on a yellow colour from sulfur impurities, or brown from iron oxides. [2]
Instead he found a white crystalline powder, borax, in the dry Searles Lake bed. [7] In 1873, he went into production as the San Bernardino Borax Mining Company to mine borax. Long mule teams were used to haul borax in wagons to San Pedro, until the much closer settlement of Mojave was used after the Southern Pacific Railroad reached it in 1876 ...
Boric acid powder is the most commonly used for this purpose. [16] [17] In the UK, many players use a version of anti-set-off spray powder from the printing industry [citation needed] which has specific electrostatic properties with particles of 50 micrometres in diameter. The powder is made from pure, food-grade vegetable starch. [citation needed]
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