How to find an unknown amount (titration)

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To determine the unknown amount of NaH_2PO_4, first identify the reaction that occurs during the titration with NaOH, which is a neutralization reaction. The balanced equation for the reaction is NaH_2PO_4 + NaOH → Na2HPO4 + H2O. Using the volume and concentration of NaOH used (22 mL of 0.1 M), calculate the moles of NaOH, which will equal the moles of NaH_2PO_4 reacted. Since only 25 mL of the diluted solution was titrated, scale the moles of NaH_2PO_4 to find the total amount in the original 250 mL solution. This process will yield the unknown concentration of NaH_2PO_4 in the original solution.
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Homework Statement


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.
 
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Oh of course. I knew it was eazy.
Thank you!
 
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