Chapter 15B TAVSS-1

Chapter 15B TAVSS-1 - CHAPTER 15 2nd HALF APPLIC. OF ACID...

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CHAPTER 15 – 2 nd HALF Problems to prepare students for hourly exam II. Buffer concepts Buffer calculations Titrations and Indicators E. Tavss 4/06 1
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BUFFER CONCEPTS 15 CHEM 162-2006 HOURLY EXAM III + ANSWERS CHAPTER 15 – APPLICATIONS OF AQUEOUS EQUILIBRIA BUFFER CONCEPTS What is the net ionic equation, when a solution of potassium hydroxide is added to a solution of nitrous acid. A. HNO 2 + K + + OH - → KNO 2 + H 2 O B. HNO 2 + H 2 O → NO 2 - + H 3 O + C. HNO 2 + KOH → K + + NO 2 - + H 2 O D . HNO 2 + OH - → NO 2 - + H 2 O E. H + + OH - → H 2 O Complete equation: HNO 2 + KOH HOH + KNO 2 Ionic equation: HNO 2 + K + + OH - HOH + K + + NO 2 - Net ionic equation: HNO 2 + OH - HOH + NO 2 - 8. CHEM162-2001 HOURLY EXAM II + ANSWERS BUFFER CONCEPTS When dissolved in 1.0 L of water, which of the following would not produce a buffer solution? A buffer solution is a weak acid and the salt of the weak acid, or a weak base and the salt of the weak base. E is a strong acid and the salt of the strong acid. Hence, it is not a buffer. A. 1.0 mol HNO 2 and 1.0 mol KNO 2 B. 1.0 mol NH 3 and 1.0 mol NH 4 Br C. 1.0 mol HNO 2 and 2.0 mol KNO 2 D. 1.0 mol HClO and 1.0 mol KClO E .1.0 mol HCl and 1.0 mol KCl 2
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CHEM162-2002 HOURLY EXAM II + ANSWERS BUFFER CONCEPTS 14. Which of the following solutions will produce a buffer? Each has a volume of 1.0 Liter. A buffer contains a weak acid and its conjugate base, or a weak base and its conjugate acid. W. A mixture of 0.20 mol CH 3 COOH and 0.10 mol NaOH A mixture of 0.20 mol CH 3 COOH and 0.10 mol NaOH will go almost to completion to provide 0.10 mol CH 3 COOH and 0.10 mol CH 3 COO - Na + , a buffer solution. X. A mixture of 0.10 mol CH 3 COOH and 0.20 mol NaOH A mixture of 0.10 mol CH 3 COOH and 0.20 mol NaOH will go almost to completion to provide 0.10 mol CH 3 COO - Na + and 0.10 mol NaOH, not a buffer solution. Y. A mixture of 0.20 mol NH 3 and 0.10 mol HC1 A mixture of 0.20 mol NH 3 and 0.10 mol HCl will go almost to completion to provide 0.10 mol NH 3 and 0.10 mol NH 4 Cl, a buffer solution. Z. A mixture of 0.10 mol NH 3 and 0.20 mol HC1 A mixture of 0.10 mol NH 3 and 0.20 mol HCl will go almost to completion to provide 0.10 mol NH 4 Cl and 0.10 mol HCl, not a buffer solution. A. all will be buffers B. Y and Z only C. X and Z only D . W and Y only E. W and X only CHEM162-2003 HOURLY EXAM II + ANSWERS 9. Which of the following combinations would be a buffer? W.
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Chapter 15B TAVSS-1 - CHAPTER 15 2nd HALF APPLIC. OF ACID...

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