What is the ph of a buffer that results when 50 mole of, Chemistry

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What is the ph of a buffer that results when 50 mole of

What is the pH of a buffer that results when .50 mole of H3PO4 is mixed with .25 mole of NaOH and diluted with water to 1.00 L (The acid disassociation constants of phosphoric acid are Ka1=7.5 *10^-3, Ka2=6.2*10^-8 and Ka3=3.6*10^-13. you use the first Ka but why?

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