Calculate the final pH resulting from the addition of 5.0 mmol of strong acid to the buffer solution made from 0.050 L of 0.50 M NaH2PO4 and 0.100 L of 0.10 M NaOH. pKa (H2PO4-)=7.21.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.