quiz 4 ch 204 - Version 058/AADCC – Quiz 4 – Lyon –...

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Unformatted text preview: Version 058/AADCC – Quiz 4 – Lyon – (52635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 1 2 3 4 5 6 7 AA AB AC AD BA BB BC 8 9 10 BACK NEXT BD CA CB CC CD Retries are allowed on this quiz. The num- ber of retries are determined by the number of possible responses to the question. Negative points are given for all incorrect answers. Pos- itive points are given only for correct answers. Remember that questions with only two pos- sible answers are worth +10, if answered cor- rectly and -10, if answered incorrectly. If you do not know the answer to a question with only two possible responses, skip it, a zero does not hurt your score as much as minus 10. 001 10.0 points Assume you will titrate a sample of sulfuric acid solution of an unknown concentration with sodium hydroxide. All of the following apply except: 1. Ideally, the end point will equal or come very close to the equivalence point. 2. The volume of sodium hydroxide solution added will be carefully measured. 3. An indicator will be used. 4. The titration depends on the volume of water added to the sulfuric acid sample. cor- rect 5. The molarity of the sodium hydroxide must be known initially. Explanation: An acid/base titration where an acid sam- ple has an unknown concentration is titrated with a base with a known concentration. The volume of the base is carefully measured so that the moles of the acid can be determined by the stoichiometry of the acid-base reaction. An indicator is used that changes color at the point when the titration should be stopped; ideally the color change will occur very close to or at the equivalence point of the neutral- ization reaction. Adding water to the acid sample does not change the number of moles of acid in the sample and does not affect the determination of the molarity of the acid fol-...
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This note was uploaded on 04/14/2010 for the course CH CH302 taught by Professor Mccord during the Spring '10 term at University of Texas at Dallas, Richardson.

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quiz 4 ch 204 - Version 058/AADCC – Quiz 4 – Lyon –...

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