PL%20Worksheet%2012

PL%20Worksheet%2012 - 6. When the strong base is added to...

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PL Worksheet #12 19.1 Buffers 1. Solve for the pH of a solution that has 0.10 M of NH 3 and 0.14 M of NH 4 Cl. The K b (NH 3 ) = 1.76 * 10 −5 . 2. Solve for the pH of the solution once 2.5 g of KOH has been added to 1.00 L of the solution described in question 1. 3. Solve for the pH of the solution once 25 g of KOH has been added to 1.00 L of the solution described in question 1. 4. Determine if each of the following would constitute a buffer solution? A) 0.100 M of HCl and 0.100 M of KCl B) 0.050 M of NaCH 3 COO and 0.075 M of CH 3 COOH C) 0.100 M of NH 3 and 0.050 M of HCl D) 0.250 M of HClO and 0.250 M of KClO 2
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19.1 Acid-Base Titration Curves Questions 5 through 10 relate to an acid-base titration beginning with a weak acid (HCOOH) and having a strong base added. 5. Describe the components of the solution, besides water, before any strong base is added. Of the components listed, which would be the most prevalent?
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Unformatted text preview: 6. When the strong base is added to account for exactly half of the moles of the weak acid, describe the components that would be present in solution. 7. When the strong base is added to account for all of the moles of the weak acid, describe the components of the solution. 8. Make a prediction for pH in question 7: 9. Which question above (5, 6 or 7) describes the equivalence point of the titration? 10. Which question above (5, 6 or 7) describes the buffer region of the titration? 19.2 Solubility 11. What is the concentration of Zn 2+ if 5528.4 g of ZnCO 3 are added to 125 L of water? K sp (ZnCO 3 ) = 1.0 * 10-10 12. Write a dissociation reaction for BaF 2 and solve for [F ]. K sp (BaF 2 ) = 1.5 * 10-6 13. Given that K a (HF) = 6.8 * 10 4 , solve for the pH of the solution in question 12....
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This note was uploaded on 11/30/2011 for the course CHEM 1212 taught by Professor Dockery during the Fall '08 term at Kennesaw.

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PL%20Worksheet%2012 - 6. When the strong base is added to...

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