CHEM 410 quiz: Ex1 Spectrophotometry how marks are assigned

General instructions: .You must show full/detailed calculations to receive full marks for each problem Please show your FINAL answer to correct number of significant figures. During intermediate steps, keep all digits in your calculator to avoid large rounding errors in the final answer. In other words, do not round off your answers during intermediate calculation steps. Use Kse values from textbook - Harris 8th or 9th edition 1. A mixture having a volume of 10.00 mL and containing 0.1000 M Ag and 0.04500 M Hg2 was titrated with 0.0800 M KCN to precipitate Hg2(CN)2 and AgCN. Ksp for Hg2(CN): = 5x 10.40 Ksp for AgCN = 22x 10.16 (c) (3 marks) Calculate pCN at 8.00 mL KCN added. (d) (4 marks) Calculate pCN at 12.50 mL KCN added (e) (4 marks) Calculate pCN at 18.00 mL KCN added. (f) (3 marks) Calculate pCN at 23.75 mL KCN added. (g) (3 marks) Calculate pCN at 28.00 mL KCN added.

General instructions: You must show full/detailed calculations to receive full marks for each problem. Please show your FINAL answer to correct number of significant figures. During intermediate steps, keep all digits in your calculator to avoid large rounding errors in the final answer. In other words, do not round off your answers during intermediate calculation steps. Use Ksp values from textbook - Harris 8th or 9th edition 1. A mixture having a volume of 10.00 mL and containing 0.1000 M Ag' and 0.04500 M Hg22 was titrated with 0.0800 M KCN to precipitate Hg2(CN)2 and AgCN. (a) (3 marks) Explain which salt will precipitate first and why. b) (3 marks) Calculate volume of KCN required to reach first and second equivalence points and sketch by hand the expected titration curve. (c) (3 marks) Calculate pCN at 8.00 mL KCN added (d) (4 marks) Calculate pCN at 12.50 mL KCN added (e) (4 marks) Calculate pCN at 18.00 mL KCN added

Write the equation for the cell reaction and indicate cathode and anode half-cells for the electrochemical cell formed from a Mg/Mg half-cell and an In/In half-cell. (5 marks) a. 2+ Calculate E for the cell where [Mg2+] = 1.50 M and [In3j = 0.00750 M. Given: (5 marks) b. In'++ 3e-- In E°=-0.34 V