Calculate the pOH of a 0.74 M solution of acetic acid (K_a = 1.8 × 10^-5) at 25°C. A) 2.77 B) 9.26 C) 4.88 D) 11.56 E) 2.44

Name: Calculate the pOH of a 0.74 M solution of acetic acid (K a = 1.8 × 10 -5 ) at 25°C. A) 2.77 B) 9.26 C) 4.88 D) 11.56 E) 2.44
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Quizplus · Accepted Answer

To find the pOH, first calculate the pH using the formula for weak acids: pH = 1/2 * (pKa - log[HA]). Here, pKa = -log(1.8 × 10^-5) = 4.74. So, pH = 1/2 * (4.74 - log(0.74)) ≈ 2.44. Then, pOH = 14 - pH = 14 - 2.44 = 11.56.

Calculate the POH of a 0