Determination of boric acid content
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When titrating boric acid with sodium hydroxide, the measured boric acid content exceeds 100% – is this possible? What could be the cause?
The original poster, please explain in detail the process; we also need to prepare boric acid
The standard allows values higher than 100%; the range for premium and first-grade products is 99.4–100.8%, while qualified products have values above 99%. Apart from measurement errors, acid-base titration means that if acids with a molecular weight lower than that of boric acid are present, this can also result in values exceeding 100%
What we do is relatively simple: we weigh an appropriate amount of sample, dissolve it, cool it down, add mannitol and phenolphthalein or a mixed indicator, and then titrate it with a sodium hydroxide standard solution.
Is there a version with a blank? Sometimes the reagent blank is very important
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