You are given sodium acetate, hydrochloric acid, sodium bicarbonate and sodium carbonate.  Determine which

of these you would need to make a buffer with pH = 4.7 by method 2.  You do not need to do calculations.

2.  You are again given sodium acetate, hydrochloric acid, sodium bicarbonate and sodium carbonate.  Determine which of these you would need to make a buffer with pH = 9.9 by method 3. You do not need to do calculations.

3.  By consulting a buffer table, suggest a buffer system (not phosphate or carbonate) and calculate acid/conjugate base ratio to get a buffer pH = 6.6.

4.  The pK_a given for the phosphate buffer is often under question.  Based upon your results, do you think the given pKa is correct?  Using the data from your experiment (assuming you used excellent lab technique), calculate the actual value of the phosphate pK_a.

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