CHEM 302 HW6 - jrr944 Homework 6 Lyon (53565) 1 This...

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Unformatted text preview: jrr944 Homework 6 Lyon (53565) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points H 3 O + is called the 1. hydroxide ion. 2. hydrogen ion. 3. hydronium ion. correct 4. hydrate ion. Explanation: H 3 O + is called the hydronium ion. 002 10.0 points A solution has [H + ] = 1 . 5 10 7 M. What is the [OH ] in this solution? 1. 6 . 7 10 7 M 2. 1 . 5 10 7 M 3. 6 . 7 10 6 M 4. None of these 5. 6 . 7 10 8 M correct Explanation: [H + ] = 1 . 5 10 7 M K w = [H + ][OH ] = 1 . 10 14 [OH ] = K w [H + ] = 1 . 10 14 1 . 5 10 7 = 6 . 7 10 8 M 003 10.0 points Addition of NH 3 to water produces a basic so- lution and one of the products of the reaction is 1. NH + 4 . correct 2. H 3 O + . 3. NH 2 . Explanation: 004 10.0 points Which acid is stronger? 1. They have the same strength. 2. HNO 2 3. HNO 3 correct Explanation: HNO 3 is he stronger oxoacid; there is one more O atom attached to the N atom in HNO 3 than in HNO 2 . This makes the H O bond more polar (and thus more easily broken) in HNO 3 than in HNO 2 . 005 10.0 points Which of the following expressions correctly describes the relationship between [H 3 O + ] and [OH ] in any aqueous solution at 25 C? 1. [H 3 O + ] [OH ] = 10 14 2. [OH ] [H 3 O + ] = 10 14 3. [H 3 O + ][OH ] = 10 14 correct 4. [H 3 O + ][OH ] = 14 5. [H 3 O + ]- [OH ] = 14 Explanation: At 25 C, K w = [H 3 O + ][OH ] = 1 . 10 14 006 10.0 points A solution has a pH of 4.35. Find the pOH. 1. 18.35 2. None of these 3. 9.65 correct 4. 4.35 jrr944 Homework 6 Lyon (53565) 2 Explanation: pH = 4.35 pOH = 14- pH = 9 . 65 007 10.0 points Which acid has the strongest conjugate base? 1. HF correct 2. HCl 3. HI 4. HBr Explanation: HBr, HCl and HI are strong acids which completely ionize in water so their conjugate base is a poor proton acceptor. HF is a weak acid which is only partially ionized in water....
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CHEM 302 HW6 - jrr944 Homework 6 Lyon (53565) 1 This...

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