Doubt from pH calculation

Can we do in this that Na3PO4 is neutral ,so we will directly use NaH2PO4 direcltly for
Ph = -log[h+]
Ph=-log0.2
Can we do this , i am confused that what is the use of ka1 ,ka2etc

@Shwetanshu_2018 sir @Bhuvanitha_2020 please help

These are amphiprotic ions so we cannot do it directly ..I will try this if I get I send.
Formula to do this kind of q
image

@Samarth_2020 @Sneha_2021 can you guys try this

Answer?

Answer is 9

soln

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