A solution of HClO4 is adjusted with 0.4125 g of primary standard purity HgO (216.6 g / mol) in a KBr solution. The reaction between HgO and KBr is as follows. HgO (s) + 4 Br- + H2O → HgBr42- + 2 OH- What is the molarity of HClO4 if 46.51 mL of acid is used to neutralize the OH-? What is the pH of the buffer obtained by mixing 50.0 mL 0.200 M NaH2PO4 with 50.0 mL 0.120 M HCl?

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