In a buffer solution consisting `NaH_2PO_4 and Na_2HPO_4 ` select the correct statement among the following

Options

A. `NaH_2PO_4 ` is acid and `Na_2HPO_4` is salt
B. The pH of solution can be calculated using the relation ` : pH =pK_2+ log _(10) "" ([HPO_4^(2-)])/([H_2PO_4^(-) ]) `
C. `Na_2HPO_4` is acid and `NaH_2PO_4` is salt
D. The pH cannot be calculated

Answer

A, B

Explanation

`H_2 PO_4^(-) to HPO_4 ^(2- ) `
` A " " " salt of Wa" `
` pH =pKa_2 +log ""(["salt"])/(["acid"]) `