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March 26, 2017

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what is the pH of an aqeuous solution with s hydroxide ion[OH-] concentration of 7.5x10-10 M?

  • chemistry - ,

    Calculate pOH from pOH = -log(OH^-).
    Then pH + pOH = pKw = 14.

  • chemistry - ,

    you have to explain these better, i don't even understand them

  • chemistry - ,

    You must tell me what you don't understand. I don't want to work the problem for you. All you need to do is to plug in OH^- and calculate pOH and from that pH. Two algebraic equations that don't get any simpler.

  • chemistry - ,

    im struggling in this class, and i need as much help as possible.

  • chemistry - ,

    I have plenty of help and I am pleased to help you as much as I can but I don't do homework. Again, I won't work the problem for you but tell me what you don't understand and we can get started on it.
    What do you not understand about
    pOH = -log(OH^-)?

  • chemistry - ,

    i understand your trying to help me..but i don't understanf anything that you have helped me.im a step by step person. that's why i thought this would work

  • chemistry - ,

    I'm glad you are a step by step person. So am I. I gave two steps.
    Step 1. pOH = -log(OH^-).
    1a. Punch in the OH^- in the problem into your calculator.
    1b. Hit the log key.
    1c. The answer jumps onto the screen.
    1d. Change the sign.
    1e. That's the pOH.

    Step 2. pH + pOH = pKw.
    2a. You know pOH from step 1.
    2b. You know pKw, or at least I assume you do. pKw is 14.
    2c. Now you have the second equation which is pH + the number for pOH = 14.
    2d. Now you solve for pH.
    2e. You have your answer and you've worked the problem.

  • chemistry - ,

    so is this what it should look like
    pOH=-log(7.5x10-10)=9.124

  • chemistry - ,

    Very good. That's the first step.
    Now step 2 is even easier.
    pH + pOH = pKw.
    pH + 9.21 = 14.
    pH = ??

  • chemistry - ,

    hmm i know its 5 something

  • chemistry - ,

    Close.
    pH + pOH = pKw
    pH + 9.21 = 14
    pH = 14 - 9.21 = ??

  • chemistry - ,

    perfect! 4.79

  • chemistry - ,

    Very good. Now you see how easy these things really are.

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