Electrolysis and Corrosion of Metals.pdf

Chemistry for Engineers 2 (Lab) EXPERIMENT 8 ELECTROLYSIS AND CORROSION OF METALS MPS Department | FEU Institute of Technology  OBJECTIVES ▪ To assemble a voltaic cell ▪ To illustrate the electrochemical nature of corrosion of iron GALVANIC CELL Galvanic...

Chemistry for Engineers 2 (Lab) EXPERIMENT 8 ELECTROLYSIS AND CORROSION OF METALS MPS Department | FEU Institute of Technology  OBJECTIVES ▪ To assemble a voltaic cell ▪ To illustrate the electrochemical nature of corrosion of iron GALVANIC CELL Galvanic cell or voltaic cell is an apparatus that generates electrical energy from redox reaction RedOx stands for reduction-oxidation Example: Mg - lost electrons, increased oxidation number H - gained electron, decreased oxidation number Cl - same, spectator ions, doesn't accept not give electrons  OXIDATION - involves the loss of electron - substance that loses electron is called reducing agent REDUCTION - involves gain of electron - substance that gains electron is called oxidizing agent MNEMONICS 1. OIL RIG (Oxidation Is Loss, Reduction is Gain) 2. LEORA (Lose Electron, Oxidation, Reducing Agent) 3. GEROA (Gain Electron, Reduction, Oxidizing Agent)  this particular arrangement of Zn and Cu electrodes is called Daniell Cell Anode is the electrode at Cathode is the electrode at which oxidation occurs which reduction occurs CELL POTENTIAL A shorthand abbreviation of the chemical reactions in a voltaic cell without drawing the whole voltaic cell REMEMBER! Left: Oxidation (anode) ex: Zn(s) 🡪 Zn2+ (aq) + 2e- Right: Reduction (cathode) ex: Cu2+(aq) + 2e- 🡪 Cu(s) Zn(s) Zn2+ (aq) + 2e- Cu2+(aq) + 2e- Cu(s) 2+ 2+ Zn(s) | Zn (aq) || Cu | Cu  EXPERIMENT SET-UP Voltmeter - measures the difference in electrical potential between the anode and the cathode Salt bridge - balances the charge in the electrodes OBSERVE SAFETY! ALWAYS wear your PERSONAL PROTECTIVE REMOVE all papers, notebooks, combustible materials and excess chemicals from the area. TIE-BACK any long hair, dangling jewelry, or loose clothing. READ chemical labels and handle with care AVOID spillage DO NOT dispose chemicals on the sink NEVER touch the chemicals with your bare hands Printed References Brown, LeMay and Bursten. (2018). Chemistry: The Central Science, 14th edition. New Jersey: Prentice Hall. Kishore,V. V. N. (2017), Renewable Energy Engineering and Technology: Principles and Practice 1st Edition, Routledge Mcpherson, Peter A C, (2017), Principles of Nuclear Chemistry, World Scientific Publishing Europe Ltd. Jones, D R H, Ashby, Michael F., (2018), Engineering Materials 1, Fifth Edition: An Introduction to Properties. Chang, Raymond. (2016). Chemistry 12th Edition. New York: McGraw Hill International Edition. Slowinski, Wolsey, Rossi. (2014). Chemistry Laboratory Manual for Science Majors, Cengage Learning Asia Pte Ltd. Online References http://chemed.chem.purdue.edu/genchem/topicreview/index.php http://www.sparknotes.com/chemistry/ http://m.learning.hccs.edu/faculty/laimutis.bytautas/chem1411 Q&A SESSION ASK ANY QUESTION RELATED TO OUR TOPIC FOR TODAY.