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# HW6_pdf - leazenby(jl35875 Homework 6 Sutcliffe(52440 1...

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Unformatted text preview: leazenby (jl35875) Homework 6 Sutcliffe (52440) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points If the value of K b for pyridine is 1 . 8 10- 9 , calculate the equilibrium constant for C 5 H 5 NH + (aq) + H 2 O( ) C 5 H 5 N(aq) + H 3 O + (aq) . 1. 1 . 8 10- 9 2. 1 . 8 10- 16 3. 5 . 6 10- 6 correct 4. 5 . 6 10 8 5.- 1 . 8 10- 9 Explanation: 002 10.0 points Calculate the resulting pH obtained by mixing 16.5 g HCl and 22.6 g NaCl in water to create 482 L solution. 1. 1.13 2. 3.03 correct 3. 5.67 4. 2.15 5. 3.92 6. 4.31 Explanation: m HCl = 16.5 g m NaCl = 22.6 g V = 482 L The resulting pH is obtained from the [H + ]. ? mol H + = 16 . 5 g HCl 1 mol HCl 36 . 45 g HCl 1 mol H + 1 mol HCl 1 482 L = 9 . 39 10- 4 M H + pH =- log[H + ] =- log[9 . 39 10- 4 ] = 3 . 03 003 10.0 points I found some ammonium sulfate sitting in a can. I mixed it with some water I had sitting in a pan. It really mixed up nicely, I thought that I would say the solution was ? on this lovely day. 1. now just basic 2. still neutral 3. now acidic correct Explanation: Ammonium sulfate is the salt of a strong acid, so it is an acidic salt. 004 10.0 points Which solution has the lowest pH? 1. 0.1 M KHCOO, K a HCOOH = 1 . 8 10- 4 2. 0.1 M KC 2 H 3 O 2 , K a HC 2 H 3 O 2 = 1 . 8 10- 5 3. 0.1 M KCl, K a HCl = very large correct 4. 0.1 M KNO 2 , K a HNO 2 = 4 . 5 10- 4 5. 0.1 M KClO, K a HClO = 3 . 5 10- 8 Explanation: The larger the K a , the stronger the acid. The stronger the acid, the lower the pH. Since the 0.1 M KCl has the highest K a , it has the lowest pH. 005 10.0 points What is [OH- ] in a solution made by dissolving 0.100 mole of sodium acetate (NaCH 3 COO) in enough water to make one liter of solution? K a for CH 3 COOH is 1 . 80 10- 5 . leazenby (jl35875) Homework 6 Sutcliffe (52440) 2 1. 1 . 34 10- 3 2. 5 . 56 10- 10 3. 5.74 4. 7 . 46 10- 6 correct 5. 5.13 6. 8.87 7. 2.87 8. 1 . 34 10- 9 9. 1 . 80 10- 6 10. 9.25 Explanation: 006 10.0 points What is the pH of a 0 . 28 M solution of anilin- ium nitrate (C 6 H 5 NH 3 NO 3 )? K b for aniline is 4 . 2 10- 10 ....
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HW6_pdf - leazenby(jl35875 Homework 6 Sutcliffe(52440 1...

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