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    Raman spectroscopic and potentiometric studies of acidity level and dissociation of citric acid in aqueous solution

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    Publication date
    2015
    Author
    Elbagerma, Mohamed A.
    Alajtal, Adel I.
    Edwards, Howell G.M.
    Azimi, G.H.
    Verma, K.D.
    Scowen, Ian J.
    Keyword
    Raman spectroscopy; Citric acid; Dissociation constants; Multiwavelength; Potentiometric
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The dissociation constant is one of the most important characteristics of a pharmaceutical chemical moiety which has to be estimated with accuracy. The development of in-situ speciation methods in solutions with parallel measurements using Raman spectroscopy (molecular) and pH (macroscopic) for the identification, characterization, and quantitative determination of citric acid species in aqueous solution by numerical data treatment using a multiwavelength curve fitting program over a range of pH values is described. As a result, the first, second and third stepwise dissociation constants of citric acid have been evaluated as 3.02±0.06, 4.78±0.06 and 6.02±0.04, respectively. From these data over the pH range 2.38-6.16 an excellent agreement with literature values was achieved.
    URI
    http://hdl.handle.net/10454/9338
    Version
    No full-text available in the repository
    Citation
    Elbagermi MA, Alajtal AI, Edwards HGM et al (2015) Raman spectroscopic and potentiometric studies of acidity level and dissociation of citric acid in aqueous solution. Journal of Applied Chemical Science International. 2(1): 1-11.
    Link to publisher’s version
    http://www.ikpress.org/abstract/3594
    Type
    Article
    Collections
    Engineering and Informatics Publications

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