Ch 4 Review

Ch 4 Review - agents From MC 4.97, label the oxidizing...

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Review: titration of a mixture A 0.235 g sample of a mixture containing 92.5% NaOH and 7.5% Ca(OH)2 requires 45.6 mL HCl solution for neutralization. What is [HCl]?
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Review: precipitation reaction In an experiment, we combine 110.0 mL 1.05 M Pb(NO3)2 with 10.0 g NaCl. What is the theoretical yield (in moles) of the resulting precipitate? What is the concentration of ions (M) in solution after the reaction is complete?
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Review: recognizing redox Indicate whether the first-named substance in each change undergoes oxidation, reduction or neither. A) Sulfur trioxide produces sulfuric acid when passed through water. B) Dinitrogen tetroxide produces nitric acid when it reacts with water. Carbon monoxide is converted to methane in the presence of hydrogen gas.
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Review: identifying redox
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Unformatted text preview: agents From MC 4.97, label the oxidizing agent and the reducing agent in the following reaction: 3 NO2 + H2O HNO3 + NO Review: acid-base reactions • A railroad tank car carrying 1500 L concentrated sulfuric acid derails and spills its load. The solution is 93.2% acid and has a density of 1.84 g/mL. How many kg sodium carbonate are needed to neutralize the acid? Review answers • Titration of a mixture: [HCl] = 0.130 M • Precipitation reaction: ppt = PbCl2; theo yield = 0.0855 mol remaining in solution [Cl-] = 0 (chloride = LR); [Na+] = 1.55 M; [NO3-] = 2.10 M; [Pb2+] = 0.27 M • a. No change b. N is oxizided from 4+ to 5+ c. C is reduced from 2+ to 4-. • Neutralization reaction: H2SO4(aq) + Na2CO3(aq) Na2SO4(aq) + H2O(l) + CO2(g) 1500 kg Na2CO3 required....
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This note was uploaded on 04/05/2012 for the course CHEM 101 taught by Professor Farahh during the Spring '02 term at UNC.

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Ch 4 Review - agents From MC 4.97, label the oxidizing...

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