Quiz 4-solutions - Version 065 Quiz 4 fakhreddine(51615 This print-out should have 5 questions Multiple-choice questions may continue on the next

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Version 065 – Quiz 4 – fakhreddine – (51615) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices before answering. 001 2.0 points Trimethylamine ((CH 3 ) 3 N) can react with water to form (CH 3 ) 3 NH + and a hydroxide ion. Which statement is true for this reac- tion? 1. H 2 O is the conjugate acid of (CH 3 ) 3 N. 2. H 2 O is the conjugate base of (CH 3 ) 3 N. 3. (CH 3 ) 3 NH + is the conjugate acid of (CH 3 ) 3 N. correct 4. The hydroxide ion is the conjugate acid of (CH 3 ) 3 N. 5. (CH 3 ) 3 NH + is the conjugate base of (CH 3 ) 3 N. 6. The hydroxide ion is the conjugate base of (CH 3 ) 3 N. Explanation: 002 2.0 points What is [H 3 O + ] when [OH - ] = 3 . 3 × 10 - 9 M? 1. 3 . 0 × 10 - 6 M correct 2. 6 . 6 × 10 - 5 M 3. 1 . 0 × 10 - 7 M 4. 3 . 3 × 10 - 5 M 5. 3 . 3 × 10 - 9 M Explanation: [OH - ] = 3 . 3 × 10 - 9 M K w = [H 3 O + ][OH - ] = 1 × 10 14 [H 3 O + ] = K w [OH - ] = 1 . 0 × 10 14 3 . 3 × 10 - 9 = 3 . 0 × 10
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This note was uploaded on 05/19/2011 for the course CHEM 51615 taught by Professor Fatima during the Spring '11 term at University of Texas at Austin.

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Quiz 4-solutions - Version 065 Quiz 4 fakhreddine(51615 This print-out should have 5 questions Multiple-choice questions may continue on the next

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