6 Points A) Explain the following: (3 pts) 1. Zn2+ has sharper equivalence point than Mga in EDTA titrations. 2. Thermally unstable substances cannot be analyzed by GLC 3. When CH3COOH titrated with NaOH, the pH of the solution at the equivalence point more than 7 B) Solve the following problems: (3 pts) 1. What is the component concentration ratio (HNO VINO2-1of an acidic buffer solution made from HNO2 and NaNO, that has a pH =pKa +17 2. What is the most effective pH buffering range for a nitrous acid, HNO/NO2-buffer. [Nitrous acid, Ka = 4.6 x 104] angiver