Labtest1_sp04 - Chemistry 220 Lab Quizzam #1 Name:...

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Chemistry 220 Lab Quizzam #1 Name: Directions: Answer the following questions in the spaces provided. Show all work and units to receive credit. Integrated Rate Equations: Acids and Bases: K a b Zero-order reaction: [A] = - kt + [A] 0 First-order reaction: ln[A] = - kt + ln[A] 0 Second-order reaction: 1/[A] = kt + 1/[A] 0 1. What is the expected pH of a 0.25 M HCl solution? 2. What is the expected pH of a solution prepared by diluting 1.00 mL of the solution in question #1 to a total volume of 1.00 L? 3. A) What is the expected pH of a 0.25 M solution of NaHCO 3 ? B) The observed pH of the system is 0.32 pH units less than expected. Suggest a possible reason. Conjugate Acid K a Conjugate Base K b HCl Very large Cl - Very small H 2 CO 3 4.2 x 10 - 7 HCO 3 - 2.4 x 10 - 8 HCO 3 - 4.8 x 10 - 11 CO 3 2 - 2.1 x 10 - 4
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4. A weak acid, “HA”, is found to be 3.2 % dissociated in 10.0 mL of solution and the solution has a pH of 4.82. The 10.0-mL solution is then diluted to 100.0 mL.
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Labtest1_sp04 - Chemistry 220 Lab Quizzam #1 Name:...

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