DETERMINATION OF MINERAL ACIDS CONCENTRATION FROM MIXTURES BY CONDUTOMETRIC TITRATION
Journal Title: BULETINUL INSTITUTULUI POLITEHNIC DIN IASI, CHIMIE SI INGINERIE CHIMICA - Year 2016, Vol 62, Issue 2
Abstract
In this study, a conductometric titration method is proposed for the quantitative determination of two mineral acids (HCl and H3PO4), both individually and from mixture. Conductometric titration assumes the experimental measuring of electrical conductivity of the analyzed solution as a function of added titrant volume, and depends by the concentration of all ions present in this solution. A solution of AgNO3 (0.1 N) was used as titrant. Both mineral acids react with AgNO3 and form low soluble compounds (AgCl and Ag2HPO4), and these reactions are the basis of their determination by conductometric titration. If, HCl can be analyzed in this way with high accuracy, regardless of whether is in mixture or not, the determination of H3PO4 acid is more difficult due to the high solubility of Ag2HPO4 precipitate. Thus, the neutralization of H3PO4 acid with NaOH (0.1 N) solution before to start the conductometric measurements is necessary, for that his quantitative determination to be possible. Therefore, the conductometric titration with AgNO3 can be used for the determination of HCl and H3PO4, both individually and from mixtures, but this is possible only after neutralization of the mineral acids with a strong base solution.
Authors and Affiliations
MONICA-MARIA ROMAN, IONELA CIURDEA, CRISTINA LAZAREV, LAURA BULGARIU
Keywords
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