Pre-laboratory Questions 1.For the half-reaction Sn+2e-Sn2 Caleulate the cell voltage,E.at 25C if the concentration of Snis 0.IM and that of Snis 0.5M,using the Nerst equation E for this cell is+0.15V. 2.Calculate AG(in kJ)for the reaction Cd+Pb*Cd+Pb If the potential,E,ofthe cell was measuredas+9V. 3.How many moles ofelectrons are involved in the electrochemical oxidation of 118.7g of Sn to Sn?How many faradays ofelectricity are involved? 4.What is the function of a salt bridge in a galvanic cell? Section PDF文件使用"pdfFactory Pro”试用版本创建n,fineprint,com,cn Pre-laboratory Questions: 1. For the half-reaction 4 2 Sn 2e Sn + - + + Calculate the cell voltage, E, at 25℃ if the concentration of Sn4+ is 0.1M and that of Sn4+ is 0.5M, using the Nerst equation. E° for this cell is +0.15V. 2. Calculate ΔG (in kJ) for the reaction 2 2 Cd Pb Cd Pb + + + + If the potential, E, of the cell was measured as +0.29V. 3. How many moles of electrons are involved in the electrochemical oxidation of 118.7g of Sn2+ to Sn4+? How many faradays of electricity are involved? 4. What is the function of a salt bridge in a galvanic cell? Name:_______________________________________________________________________ Data:___________________ Section:______________________________________________ PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn