32 Experiment P (Titration of a Weak Acid): A sample of acetic acid (initial con

Question

32 Experiment P (Titration of a Weak Acid): A sample of acetic acid (initial concentration 0.500 M) was titrated using NaOH and a titration curve was prepared. An experimental value for pKa of 4.65 was obtained. Which of the following species (HA represents the acetic acid and A the acetate anion) has the larger concentration at pH 3.7; and at pH 5, respectively? (a) HA at pH-3.7; and A at pH-5 (b) HA at pH-3.7; and H30+ at pH-5 (e) AT at pH3.7; and OH at pH-5 (c) ATat pH-3.7; and HA at pH-5 (d) H3o+ at pH-3.7; and A"at pH-5

Explanation / Answer

Answer:-

(a). HA at pH = 3.7 ; and A- at pH = 5

Because, pH = pKa + log[A-]/[HA]

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