Quiz 3-solutions-1

Quiz 3-solutions-1 - Version 126 – Quiz 3 – laude...

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Unformatted text preview: Version 126 – Quiz 3 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 5.0 points 200 mL of a 2 M solution of sodium chlorite (NaClO 2 ) is titrated with 500 mL of 0.6 M HBr. What is the approximate pH of the resulting solution? HClO 2 has a pK a of 2. 1. 7 2. 2.5 3. 6 4. 2 5. 1.5 correct Explanation: [H + ] = K a C a C b = 10- 2 (0 . 5 L)(0 . 6 M) (0 . 2 L)(2 M)- (0 . 5 L)(0 . 6M) = 3 × 10- 2 pH ≈ 1 . 5 002 5.0 points How many equations are needed to fully determine an aqueous system containing the acid H 3 PO 4 ? 1. 7 2. 4 3. 5 4. 6 correct Explanation: The system would have an unknown value for [H + ], [OH- ], [H 3 PO 4 ], [H 2 PO 4- ], [HPO 4 2- ] and [PO 4 3- ]. 003 5.0 points A 50 mL sample of Ca(OH) 2 is titrated to the equivalence point by 200 mL of an HCl solution which has a pH of 1. What was the molarity of the Ca(OH) 2 solution before the addition of any HCl?...
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This note was uploaded on 06/14/2011 for the course MATH 305G taught by Professor Cathy during the Spring '11 term at University of Texas.

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Quiz 3-solutions-1 - Version 126 – Quiz 3 – laude...

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