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Mannitol is a type of sugar alcohol used as a sweetener and medication. [5] [6] ... Mannitol can be used to form a complex with boric acid. This increases the acid ...
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.
The addition of mannitol to an initially neutral solution containing boric acid or borates lowers the pH enough for the be titrated by a strong base as NaOH, including with an automated a potentiometric titrator. This is a reliable method to assay the amount of borate content present in the solution. [3]
Borate esters form spontaneously when treated with diols such as sugars and the reaction with mannitol forms the basis of a titrimetric analytical method for boric acid. Metaborate esters show considerable Lewis acidity and can initiate epoxide polymerization reactions. [ 4 ]
Boric acid is an antiseptic used as a vaginal medication to treat vaginal infections including yeast infections, bacterial vaginosis, and trichomoniasis. [5] [2] It is administered as a capsule or suppository inserted into the vagina. [2] [6] The compound is not a pharmaceutical drug and is instead available over-the-counter.
In animals, boric acid/borate salts are essentially completely absorbed following oral ingestion. Absorption occurs via inhalation, although quantitative data are unavailable. Limited data indicate that boric acid/salts are not absorbed through intact skin to any significant extent, although absorption occurs through skin that is severely abraded.
When orthoborate salts are dissolved in water, the anion converts mostly to boric acid B(OH) 3 and other hydrogen-containing borate anions, mainly tetrahydroxyborate [B(OH) 4] −. The reactions of orthoborate in solution are therefore mostly those of these compounds.
Citric acid – food acid; Citric acid esters of mono- and diglycerides of fatty acids – emulsifier; Citrus red 2 – color (red) Cloves – Cochineal – color (red) Coconut oil – a cooking oil, high in saturated fat – particularly used in baking and cosmetics. Sage (Salvia officinalis) – Copper complexes of chlorophylls – color ...