You want to prepare 1.00 L of a buffer solution with a pH of 3.5. You are given an 0.45 M solution of nitrous acid, HNO 2 , and an 0.68 M solution of NaOH. What volume of each of these solutions must...

You want to prepare 1.00 L of a buffer solution with a pH of 3.5.  You are given an 0.45 M solution of nitrous acid, HNO₂, and an 0.68 M solution of NaOH.  What volume of each of these solutions must be mixed in order to get the desired buffer solution?
Use the simultaneous equations method to solve this problem.

b) If the acid used in a. was nitric acid, HNO₃, could the same buffer solution be made? Briefly explain.

C) If the buffer solution prepared in a. also contained ~10^–6M Ni²⁺
and ~10^–6
M Pb²⁺
, could those metal ions be separated from each other by saturating the solution with H₂S? Explain your answer by showing the necessary calculations.