1B-S10-Quiz-3-v2 - H 2 PO 4 2 H 2 SO 3 H 3 PO 4 HSO 3-b The...

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Quiz 3 Name: Chem 1B, Spring 10 Fossum HC 2 H 3 O 2 K a = 1.8 × 10 -5 Always show your work and explain your reasoning, include units, and check significant figures. 1. (4 points) C (s) + 2 Cl 2 (g) CCl 4 (g) H = - 106.7 kJ Assume you start with a mixture of the above substances that is already at equilibrium. For each of the following changes, state which way the equilibrium will shift and explain why. What will happen to the partial pressure of CCl 4 in each case? a. Decrease the pressure b. Increase the temperature 2. (3 points) a. Label each substance in the following equation as either an acid or a base.
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Unformatted text preview: H 2 PO 4 2-+ H 2 SO 3 H 3 PO 4 + HSO 3-b. The overall K c value for the above reaction is less than one. Which is the stronger of the two acids? Explain your reasoning. 3. (5 points) Calculate the pH of a 0.23 M HC 2 H 3 O 2 solution. 4. (8 points) 3 A (g) + 2 B (g) 2 C (g) + D (g) K p = 5.5 × 10-9 If you start with a mixture of 0.500 atm C and 0.300 atm D, calculate the partial pressures of all substances once the system reaches equilibrium....
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