Explain the process used to choose the correct buffer

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Reference no: EM13195647

1 What would you use to prepare a buffer system with a pH of around 4.2. What would you use to make a buffer with a pH of around 9.2? Describe the process you used to choose the correct buffer for each pH.

2 A buffer is made by mixing NH4Cl and NH3. Which is the acid component and which is the base component? What is the Ka and pKa for this buffer?

3 A buffer is made by mixing 0.30 moles of propanoic acid, C H 3 C H 2 COOH , and 0.20 moles of sodium propanoate, CH 3 CH 2 COO^- N a + . What will the pH of the solution be?

4 For the solution in question 5, show the reaction that takes place when a strong acid , HCl, is added to the solution. Show the reaction that takes place when a strong base, NaOH, is added to the solution.

5 When a strong acid is added to a buffer solution, does the pH of the buffer go up or down? Use the Henderson - Hasselbalch equation to explain why this is so. Also use this equation to explain what happens when a strong base is added t o the buffer

Reference no: EM13195647

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