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Homework Help: How to find an unknown amount (titration)

  1. Oct 17, 2011 #1
    1. The problem statement, all variables and given/known data
    I'm given an unknown amount (around 20mL) of NaH_2PO_4 and I dilute it in distilled water in a 250mL flask. Then I take 25mL of this solution and add 4 drops of thymolphthalein in another flask. Then I titrate it with 0.1M of NaOH until it becoms light blue. I used 22mL of NaOH.

    I'm suppose to find out the amount of NaH_2PO_4 I was given.
    I'm lost. Any help would be appreciated.
  2. jcsd
  3. Oct 17, 2011 #2


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    Staff: Mentor

  4. Oct 17, 2011 #3
    Oh of course. I knew it was eazy.
    Thank you!
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