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.