F Chapter 15 Regular Homework x Highlander Help CHEM126- x C Chemistry question

Question

F Chapter 15 Regular Homework x Highlander Help CHEM126- x C Chemistry question I chegg.co x Anthony C njit2.mrooms.net/mod/quizlattempt.php?attempt 744739 Apps Noodle Pipeline Soundcloud D Acid/Base Calcula Weak Acid Equilibrium Question 5 What is the pH of pure water at 250C? Not yet answered Answer: Marked out of 1.00 Flag question Question 6 When a small amount of acid is added to a non-buffered solution, there is a large change in pH. Not yet answered Calculate the pH when 22.2 mL of 0.0020 M HCl is added to 100.0 mL of pure water. Comment and hint in the general feedback. Marked out of 1.00 Flag question Answer Question 7 A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. answered Marked out of 1.00 The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. Flag question Answer Question 8 A buffered solution resists a change in pH Not yet answered Calculate the pH when 28.9 mL of 0.022 M HCI is added to 100.0 mL of the above buffer. Marked out of 1.000 Flag question Answer: Question 9 Neutralization examples

Explanation / Answer

5)
At 25 oC,
Kw = 1.0*10^-14
[H+] = 1*10^-7

and hence ,
pH = 7

Answer: 7.0

6)
mol of HCl added = M*V
= 0.0020 M * 22.2 mL
= 0.0444 mmol

total volume = 22.2 mL + 100.0 mL = 122.2 mL

[HCl] = 0.0444 mmol / 122.2 mL
= 3.63*10^-4 M

pH = -log [H+]
= -log (3.63*10^-4)
= 3.44

Answer: 3.44

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