Qestion- what is the ph of a phosphate buffer when h2po4- , Chemistry

Qestion- what is the ph of a phosphate buffer when h2po4-

Question- What is the pH of a phosphate buffer when [H2PO4-] = [H2PO4^2-] ? I have the pka for HsPO4- is 7.20. The pka for HCH3O2 is 4.74. The Ka for the system is ka2= 6.3e-8. For H3PO4 the first acidic proton has ka1= 7.2e-3

I know we are supposed to utilized pka and the Henderson-Hasselbach equation

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Chemistry: Qestion- what is the ph of a phosphate buffer when h2po4-

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