Chem100A_Exp5_Buffer&Indicators_QuizKEY_20110427

Chem100A_Exp5_Buffer&Indicators_QuizKEY_20110427 -...

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Spring 2011 Student ID:_______________________________ Experiment 5: Buffer and Indicators Quiz #4 (20 points)–April 27, 2011 1. (4 points) Choose the best possible answer: a. What happens to the pH of a buffer solution if a small amount of acid is added? a.i. pH remains constant a.ii. pH increases slightly a.iii. pH decrease slightly a.iv. pH decreases significantly b. Which term best describes a mixture of a weak acid and its conjugate base, each within distinguishing colors? b.i. Buffer b.ii. Titration b.iii. Indicator b.iv. Conjugate c. What do a chemical indicator and buffer solution typically both contain? c.i. A strong acid and its conjugate acid c.ii. A strong acid and its conjugate base c.iii. A weak acid and its conjugate acid c.iv. A weak acid and its conjugate base d. An example of a common strong acid is…. d.i. HCl d.ii. HNO 3 d.iii. HI d.iv. All of the above 2. (4 points) What is the pH of a 0.1M NaAc (sodium acetate) solution when activity is ignored (K a for acetic acid, HAc, is 1.7 x 10 -5 )?
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Chem100A_Exp5_Buffer&Indicators_QuizKEY_20110427 -...

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