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Converting pOH into [OH-] question

Discussion in 'Pre-Dental' started by KristenD77, Aug 24, 2015.

  1. KristenD77

    KristenD77 Predent
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    Hello can someone please help me with this problem. I'm having the hardest time figuring it out.

    If the pH is 4.9 what is the [OH-]

    So I know that the pOH is -9 so the [OH-] would be 10^ -9 but the answer is 7.9 x 10 ^ -10

    I really can't figure out how to get that number without a calculator
    Help would be GREATLY appreciated!
     
    #1 KristenD77, Aug 24, 2015
    Last edited: Aug 24, 2015
  2. KristenD77

    KristenD77 Predent
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    Thank you so much!
     
    karanja likes this.

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