3.11. What is the pH of a solution made by mixing \( 0.40 \mathrm{~mol} \mathrm{NaOH}, 0.25 \mathrm{~mol} \mathrm{Na}{ }_{2} \mathrm{HPO}_{4} \), and \( 0.30 \mathrm{~mol} \mathrm{H}_{3} \mathrm{PO}_{4} \) with water and diluting to \( 2.00 \mathrm{~L} ?\left(\mathrm{pK}_{\mathrm{a} 1}=2.12 ; \mathrm{pK}_{\mathrm{a} 2}=7.21 ; \mathrm{pK}_{\mathrm{a} 3}=2.32\right) \) \( [\mathrm{pH}=7.45 \) ]
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