QUESTION 4 (15 MARKSI (a) You have 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodi

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Question 4 15 Marksi A You Have 500 0 Ml Of A Buffer Solution Containing 0 20 M Acetic Acid Ch3cooh And 0 30 M Sodi 1 (85.21 KiB) Viewed 32 times

QUESTION 4 (15 MARKSI (a) You have 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution? [Kg = 1.8 x 10-5] [5 Marks] Ans: 5.07 (b) Calculate the pH at the equivalence point for the titration of 0.20 M HCl with 0.20 M NH3 (Kb = 1.8 x 10-5). [6 Marks] Ans: 5.13 (c) What is the pH at the 10 mL of added base in the titration of 100 mL of 0.10M HCN (K4 = 4.9 x 10-10) with 0.10 M NaOH? [4 Marks] Ans: 8.35