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Find pH of solution prepared by mixing 100 ml. `0.1 M Na_3PO_4` and 200 ml , `0. 1 ` M HCl `( P^(kal) , P^(ka2 ) & P^(ka 3) " of " H_3PO_4 " are " 3,7 & 1 0` respectively)

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The correct Answer is:
5
`{:(Na_3PO_4 +, HCl to, Na_2HPO_4+ NaCl),( 10 m " mole " , 20 m " mole ",) ,( , 10 m " mole " , ) , ( , 10 m " mole " , ) :}`
`{:( HPO_4^(_2) +, H^(+) to, H_2PO_4^(-) ),( 10 , 10 , 0),( -,-, 10 m " moles" ) :}`
`pH =(P^(K_a_1)+P^(Ka_2) )/( 2) = 5`
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