Chem1BExam3SampleTest

Chem1BExam3SampleTest - Chem 1B Exam 3 Sample Questions...

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Chem 1B Exam 3 Sample Questions Instructions: For all mathematical problems, show your work. Give the basic formula (if there is one), rearrange it if necessary, plug in data with units, round properly to the correct number of significant figures, and place a box around the answer. For essay questions, be complete, but concise. Complete sentences with proper spelling and punctuation are expected. Useful information: K w = 1.0 × 10 -14 Spectrochemical series: CO > CN 1- > NO 2 1- > en > NH 3 > H 2 O > OH 1- > F 1- > Cl 1- > Br 1- > I 1- 1. (10 pts.) How many moles of sodium benzoate, NaC 7 H 5 O 2 , must be added to 1.00 L of 0.150 M benzoic acid, HC 7 H 5 O 2 , to form a buffer solution of pH 4.60? K a for benzoic acid is 6.4 × 10 -5 . 2. (10 pts.) To 50.0 mL of 0.120 M hydrazoic acid, HN 3 , is added 25.0 mL of 0.175 M sodium hydroxide solution. Calculate the pH of the resulting solution. K a for hydrazoic acid is 1.9 × 10 -5 .
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3. (10 pts.) Calculate the molar solubility of La(OH) 3 . K sp = 2.0 × 10 -21 4. (9 pts.) Silver ion forms the stable complex ion Ag(CN) 2 1- . Write the balanced equation for dissolving solid AgCl in an aqueous solution containing cyanide ion and compute the value of K
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This note was uploaded on 12/21/2010 for the course CHEM 1B taught by Professor Garyj.decicco during the Fall '10 term at Santa Rosa.

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Chem1BExam3SampleTest - Chem 1B Exam 3 Sample Questions...

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