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Homework Help: [OH-] written in mol

  1. Dec 4, 2014 #1
    1. The problem statement, all variables and given/known data
    Hi i need to just check if i have understood this.
    The problem statement is that i need to find out what [OH-] is in micromolar/L and nanomolar/L for pH 6

    2. Relevant equations
    The equation im using is that 10pH-14

    3. The attempt at a solution
    My attempt was using the pH i was given and putting it in the equation. So i got that 106-14 = 10-8 micromolar/L and 10-8 nanomolar/L

    But i am a bit unsure because the way it is questioned is a bit tricky, since i dont think they would let people get away with just changing the writing "micromolar/nanomolar"

    So if anyone would please check it out and just tell me if what i did was right or wrong and what is wrong in that case i would be happy
    Last edited: Dec 4, 2014
  2. jcsd
  3. Dec 4, 2014 #2


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    Staff: Mentor

    Where to start...

    What does it mean "micromole"? "Nanomole"?

    "Molar" typically means concentration measured in mole/L. We don't say molar/L, as the "/L" part is understood to be already there.
  4. Dec 4, 2014 #3
    Ok i meant mmole and nmole. However did i understand it right, the way to solve it?
  5. Dec 5, 2014 #4


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    Staff: Mentor

    Hard to say. The way you wrote it may suggest you have no idea what you are doing, which is why I tried to start at the very beginning.

    What is "micromole", what is "nanomole"? Is it possible for a solution to have the same concentration expressed in micromoles/L and nanomoles/L? That's what you wrote in the opening post.
  6. Dec 5, 2014 #5


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    Homework Helper
    Gold Member

    That's not an equation.

    If you stated what exactly it is a formula for you might avoid the mistakes you have made.
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