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Quiz 5 Acid_Base Titration-solutions

Quiz 5 Acid_Base Titration-solutions - Version 089/ABBCB...

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Version 089/ABBCB – Quiz 5 Acid/Base Titration – lyon – (51155) 1 This print-out should have 10 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 001 10.0points In a basic solution, the color of phenolph- thalein is 1. orange 2. pink correct 3. yellow 4. colorless Explanation: The indicator phenolphthalein is often used in acid-base titrations because the solution changes to a pink color when the reaction so- lution becomes basic, which means the reac- tion solution has an excess of hydroxide ions. In acidic solutions, the hydrogen ion is in ex- cess and the solution is colorless. At the end of the titration, the lighter the pink color, the closer the end point is to the equivalence point. 002 10.0points Select the response that includes all the meth- ods that were used during the titration of the unknown concentration of the strong acid.
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