2. What is the pH after addition of 0.015 mol HCL 3. What is the pH after additi

Question

2. What is the pH after addition of 0.015 mol HCL 3. What is the pH after addition of 0.150 mol of NaOH ? Exercise 16.47 A 200.0 mL buffer solution is 0.230 Min acetic acid and 0.230 Min sodium acetate. Part A What is the initial pH of this solution? Express your answer using two decimal places. A Submit My Answers Give Up Part B What is the pH after addition of 0.0150 mol of HCI? Express your answer using two decimal places. pH Submit My Answers give Up Part C what is the pH after addition of a 0150 mol of NaOH? Express your answer using two decimal places. ca pH

Explanation / Answer

A) pH = pKa + log [CH3COONa] / [CH3COOH]

pKa of CH3COOH = 4.74 standard value

pH = 4.74 +log [0.230] / [0.230]

pH = 4.74

part B) 0.015 / 0.2 = 0.075 M HCl added

[CH3COONa] = 0.230 - 0.075 = 0.155 M

[CH3COOH] = 0.230 + 0.075 = 0.305 M

pH = 4.74 + log [0.155] / [0.305]

pH = 4.45

part C) 0.015 / 0.2 = 0.075 M NaOH added.

[CH3COONa] = 0.230 + 0.075 = 0.305 M

[CH3COOH] = 0.23 - 0.075 = 0.155 M

pH = 4.74 + log [0.305] / [0.155]

pH = 5.03

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