Gouri Shankar posted an Question
September 10, 2020 • 16:36 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Why we use activity rather than concentration in electrochemistry.

why we use activity rather than concentration in electrochemistry.

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    Abhishek kumar singh Best Answer

    activity is ' effective concentration ' and can be used in non ideal conditions ( for concentrated solution) while concentration term is used in ideal solution ( diluted solution). In electrochemistry study of concentrated solution is easier as

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    Priyanshu kumar

    For the diluted solutions there is no problem, but once the solutions get more concentrated discrepancy between calculated and observed concentrations in equlibrium rises. That's why the activity concept was introduced. 

  • Suman Kumar

    https://www.google.com/url?sa=t&source=web&rct=j&url=https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/Solutions_and_Mixtures/Nonideal_Solutions/Activities_and_their_Effects_on_Equilibria%23:~:text%3DSince%2520the%2520Van%2520der%2520Waals,ideal%2520solutions.%26text%3DAs%2520solutions%2520get%2520more%2520concentrated,smaller%2520than%2520the%2520formal%2520concentration.&ved=2ahUKEwiKua69793rAhVmzzgGHfnWDwsQFjABegQIBRAE&usg=AOvVaw2aEUE-3UxsELgqRWD__4fy&cshid=1599716337701

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    Dinesh khalmaniya 1 best-answer

    Since the Van der Waals equation describes real gases instead of the ideal gases law, activity can be used in place of concentration to describe the behavior of real solutions vs. ideal solutions. ... As solutions get more concentrated, the activities of all of the species tend to be smaller than the formal concentration

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