solution6_pdf - ig996 – Homework 6 – Lyon – (53565) 1...

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Unformatted text preview: ig996 – 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. hydrate ion. 2. hydrogen ion. 3. hydronium ion. correct 4. hydroxide 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. None of these 2. 6 . 7 × 10 − 8 M correct 3. 1 . 5 × 10 − 7 M 4. 6 . 7 × 10 − 6 M 5. 6 . 7 × 10 − 7 M 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 − 2 . 2. H 3 O + . 3. NH + 4 . correct Explanation: 004 10.0 points Which acid is weaker? 1. HNO 2 correct 2. HNO 3 3. They have the same strength. 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. [H 3 O + ]- [OH − ] = 14 3. [OH − ] [H 3 O + ] = 10 − 14 4. [H 3 O + ][OH − ] = 10 − 14 correct 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 ig996 – 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. HI 2. HCl 3. HF correct 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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This note was uploaded on 07/15/2008 for the course CHE 302 taught by Professor Davidvandenbout during the Spring '08 term at University of Texas.

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solution6_pdf - ig996 – Homework 6 – Lyon – (53565) 1...

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