HW5_pdf - leazenby (jl35875) Homework 5 Sutcliffe (52440) 1...

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Unformatted text preview: leazenby (jl35875) Homework 5 Sutcliffe (52440) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Please note that p just equals negative log of so we can have pH, pOH , pK a etc. 001 10.0 points Choose the pair of concentrations that cannot be in a given aqueous solution at 25 C. 1. [H 3 O + ] = 10 3 M : [OH ] = 10 11 M 2. [H 3 O + ] = 10 14 M : [OH ] = 1 M 3. Any of these could exist. correct 4. [H 3 O + ] = 10 7 M : [OH ] = 10 7 M 5. [H 3 O + ] = 10 M : [OH ] = 10 15 M Explanation: All of these concentrations are possible. Re- call that pH can exist beyond the 1-14 range, but at 25 C, pH + pOH = 14 always applies. 002 10.0 points Which pH represents a solution with 1000 times higher [OH ] than a solution with pH of 5? 1. pH = 5000 2. pH = 3 3. pH = 1 4. pH = 2 5. pH = 6 6. pH = 4 7. pH = 0.005 8. pH = 7 9. pH = 8 correct Explanation: pH = 5 pOH = 14- pH = 14- 5 = 9 [OH ] = 10 pOH = 10 9 M [OH ] x = 1000 [OH ] = (10 3 )(10 9 M) = 10 6 M pOH x =- log(OH x ) = 6 pH x = 14- pOH x = 14- 6 = 8 003 10.0 points Sea water has a pH = 8.1. What is its hydro- nium ion concentration? 1. 1 . 10 8 M 2. 1 . 3 10 6 M 3. 8 . 10 1 M 4. 5.9 M 5. 7 . 9 10 9 M correct Explanation: 004 10.0 points At about what pH does pH = [H + ]? 1. pH = 0.4 correct 2. pH = 15.0 3. pH =- 1.0 4. pH = 1.0 Explanation: [H + ] = 10 pH When pH =- 1 . 0, [H + ] = 10 When pH = 0.4, [H + ] = 10 . 4 = 0.40 When pH = 1.0, [H + ] = 10 1 When pH = 15.0, [H + ] = 10 15 005 10.0 points What is the pH of a solution for which [OH ] equals 7 . 34 10 10 M? leazenby (jl35875) Homework 5 Sutcliffe (52440) 2 Correct answer: 4 . 8657. Explanation: [OH] = 7 . 34 10 10 M pH = ?...
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This note was uploaded on 06/06/2011 for the course CHEM 301 taught by Professor Wandelt during the Spring '08 term at University of Texas at Austin.

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HW5_pdf - leazenby (jl35875) Homework 5 Sutcliffe (52440) 1...

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