Post-lab 8 Acid Base Equilibria-problems-1

Post-lab 8 Acid Base Equilibria-problems-1 - wetsel (zpw67)...

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Unformatted text preview: wetsel (zpw67) Post-lab 8 Acid Base Equilibria lyon (51900) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A 0.10 M solution of the weak acid HClO con- tains 5.9 10- 5 moles of H 3 O + ions per liter. What is the ionization constant of HClO? 1. 3 . 5 10- 9 2. 3 . 5 10- 10 3. 5 . 9 10- 5 4. 3 . 5 10- 8 5. 5 . 9 10- 4 002 10.0 points A buffer solution containing acetic acid and sodium acetate is resistant to large change in pH when a strong base is added because 1. the acetate ion reacts with part of the hydroxide ions so that the effect on the pH is small. 2. some of the acetate ion hydrolyzes pro- ducing hydronium ions, which partly neutral- ize the added base. 3. some of the acetic acid donates protons to neutralize the added hydroxide ions. 4. some of the added hydroxide ions react with hydronium ions from the acid and more acetic acid is then formed from the acetate ions present. 5. the stated effect would not occur; this solution is buffered only against the addition of a strong acid. 003 10.0 points How many grams of NaF (of MW 42.0) would have to be added to 2.00 L of 0.100 M HF to yield a solution with a pH = 4.00?...
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Post-lab 8 Acid Base Equilibria-problems-1 - wetsel (zpw67)...

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