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Concentration of OH in HCl

  1. Apr 21, 2016 #1
    1. The problem statement, all variables and given/known data
    At 10 C, the concentration of OH in 1 M of HCl is approximately:

    Answer: 3x10^15

    2. Relevant equations
    Kw=KaKb

    3. The attempt at a solution
    This answer throws me off. If we assume that HCl completely dissociates, we use the [H+] from the acid in the above equation:
    1x10^-14 = 1 [OH]

    I get 1 x 10^-14, not 3 x 10^-15. What am I missing here? Is my book wrong? Thanks.
     
  2. jcsd
  3. Apr 21, 2016 #2

    Borek

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    Staff: Mentor

  4. Apr 24, 2016 #3
    Thanks for the table but I still don't think I get it. Since this is for the mcat, how am I supposed to calculate the OH concentration at 10 C?
     
  5. Apr 25, 2016 #4

    Borek

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    Staff: Mentor

    What is the definition of Kw?
     
  6. Apr 25, 2016 #5
    Kw is the equilibrium constant for [H+] and [OH-]. In aqueous solution, Kw remains at 10^-14.
     
  7. Apr 26, 2016 #6

    Borek

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    Staff: Mentor

    Have you really seen the table? What is the Kw value at 10°C?
     
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