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STK1213 Analytical Chemistry 1 Study Questions

1. An aqueous solution has a pH of 3.75. What is the hydronium ion concentration of the solution? Is it acidic or basic? [ 5 marks]

2. Calculate the pH of 1.00 M HC2H3O2 solution. (Ka = 1.8 x 10-5 ) [ 5 marks]

3. What is the pH of a 0.100 M solution of ammonia ? (Kb NH3 = 1.8 x 10-5)[ 10 marks]

4. A phosphate buffer with pH = 7.40 is prepared using KH2PO4 and K2HPO4. What is the molar ratio of [HPO42-] to [H2PO4-] in the buffered solution? [ 5 marks]

5. A buffer solution was prepared by dissolving 10.0 grams of sodium acetate in 200.0 mL of 1.00 M acetic acid. Assuming the change in volume is not significant, estimate the pH of the acetic acid/sodium acetate buffer solution. The Ka for acetic acid is 1.7 x 10-5. [ 5 marks]...