Chapter8

Chem 6a michael j sailor uc san diego 32 problem

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Unformatted text preview: E so much larger than 1st or 2nd IE? Chem 6A Michael J. Sailor, UC San Diego 32 Problem: Predicting Common Oxidation States from Ionization Energy The ionization energies for lead are given below. Based on this information, predict the common oxidation states for this element. Chem 6A Michael J. Sailor, UC San Diego 33 Lead in the Washington, DC water supply March 12, 2004 Steve Curwood radio interview with Marc Edwards on “Living on Earth:” D.C. WATER WOES CURWOOD: “Last year, at the request of some Washington, D.C. residents, Marc Edwards, a civil engineer and corrosion spet with Virginia Tech, began testing the quality of drinking water being piped into their homes. Soon, he says, he found concentrations of lead in that water that he describes as being literally off the charts. Some of the levels were so high that the water could be considered hazardous waste.” http://www.loe.org/ETS/organizations.php3?action=printContentItem&orgid=33&typeID=18&itemID=195#feature3 33 Chem 6A Michael J. Sailor, UC San Diego 34 Solution: Predicting Common Oxidation States from Ionization Energy 7000 IE, KJ/mol 6000 5000 Pb3+ → Pb4+ 4000 3000 2000 Pb+ → Pb2+ 1000 0 1 2 3 State 4 5 Pb2+, Pb4+ are the most common oxidation states for Pb. Chem 6A Michael J. Sailor, UC San Diego 35 Inert Pairs Sn2+, Tl+, Pb2+, Bi3+ are stable ions, even though they do not have a noble gas configuration: Pb: [Xe] 6s25d106p2 Pb2+: [Xe] 6s25d10 Pb4+: [Xe] 5d10 The s electrons are not as easily removed in these elements--a pair of s electrons is “inert” Common oxides of lead: PbO, PbO2 Chem 6A Michael J. Sailor, UC San Diego 36 Lead in the Washington, DC water supply March 12, 2004 Steve Curwood radio interview with Marc Edwards on “Living on Earth:” D.C. WATER WOES CURWOOD: “Last year, at the request of some Washington, D.C. residents, Marc Edwards, a civil engineer and corrosion spet with Virginia Tech, began testing the quality of drinking water being piped into their homes. Soon, he says, he found concentrations of lead in that water that he describes as being literally off the charts. Some of the levels were...
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This note was uploaded on 11/16/2011 for the course CHEM 6A taught by Professor Pomeroy during the Spring '08 term at UCSD.

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