PExam02

# PExam02 - Name: _ Date: _ 1. In a solution prepared by...

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Name: ___________________________________ Date: ______________ 1. In a solution prepared by dissolving 0.100 mole of propionic acid in enough water to make 1.00 L of solution, the pH is observed to be 1.348. The K a for propionic acid (HC 3 H 5 O 2 ) is: A) 4.49 × 10 -2 B) 3.65 × 10 -2 C) 8.14 × 10 -1 D) 2.74 × 10 -13 E) none of these 2. Calculate the pH of a 0.005 M solution of potassium oxide, K 2 O. A) 12.0 B) 11.7 C) 7.0 D) 2.3 E) 2.0 3. Calculate the pH of a 4.5 M solution of aniline (C 6 H 5 NH 2 ; K b = 3.8 10 -10 ): A) 4.38 B) 9.62 C) 5.23 D) 8.77 E) none of these 4. For the reaction below, K p = 1.16 at 800.°C. <===> If a 41.3-gram sample of CaCO 3 is put into a 10.0-L container and heated to 800.°C, what percent of the CaCO 3 will react to reach equilibrium? A) 16.5 % B) 31.9 % C) 42.8 % D) 100.0 % E) none of these Page 1

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5. Which of the following compounds has the lowest solubility in mol/L in water? A) Al(OH) 3 K sp = 2 × 10 –32 B) CdS K sp = 1.0 × 10 –28 C) PbSO 4 K sp = 1.3 × 10 –8 D) Sn(OH) 2 K sp = 3 × 10 –27 E) MgC 2 O 4 K sp = 8.6 × 10 –5 6. Calculate the solubility of Ca 3 (PO 4 ) 2 (s) ( K sp = 1.3 × 10 -32 ) in a 0.037 M Ca(NO 3 ) 2 solution. A) 8.0 × 10 -15 mol/L B) 1.6 × 10 -14 mol/L C) 3.0 × 10 -16 mol/L D) 6.4 × 10 -29 mol/L E) none of these Use the following to answer question 7. A 50.0-mL sample of 2.0 × 10 –4 M CuNO 3 is added to 50.0 mL of 4.0 M NaCN. Cu + reacts with CN to form the complex ion Cu(CN) 3 2– : Cu(CN) 3 2– <===> Cu + + 3CN 7. The concentration of CN at equilibrium is A) 4.0 M B) 2.0 M C) 1.0 M D) 6.0 × 10 –4 M E) none of these 8. The K f for the complex ion Ag(NH 3 ) 2 + is 1.7 × 10 7 . The K sp for AgCl is 1.6 × 10 –10 . Calculate the molar solubility of AgCl in 1.0 M NH 3 . A) 5.2 × 10 –2 B) 4.7 × 10 –2 C) 2.9 × 10 –3 D) 1.3 × 10 –5 E) 1.7 × 10 –10 Page 2
Use the following to answer question 9. Determine whether the following oxides produce an acidic, basic, or neutral solution when dissolved in water: 9. SO 2 10. The solubility of Cd(OH) 2 in water is 1.68 × 10 -5 mol/L. The K sp value for Cd(OH) 2 is: A) 1.90 × 10 -14 B) 4.74 × 10 -15 C) 5.64 × 10 -10 D) 1.68 × 10 -5 E) none of these Use the following to answer question 11. Nitric oxide, an important pollutant in air, is formed from the elements nitrogen and oxygen

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## This note was uploaded on 11/04/2008 for the course CHEM 104 taught by Professor Quigley during the Spring '08 term at CUNY Hunter.

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PExam02 - Name: _ Date: _ 1. In a solution prepared by...

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