session masteringchemistry.com Post Lecture Homework Chapter 16 Exercise 1 with

Question

session masteringchemistry.com Post Lecture Homework Chapter 16 Exercise 1 with feedback previous 4 of Exercise 16.16 with feedback Part A 1600 mL of 0.25 M HF with 220.0 mL of0.32 M NaF You may want to reference Express your answer using two decimal places. pages 659.662) section 16.3 while completing this problem. Calculate the pH of the solution that results from each of the following mixtures. pH Submit My Answers Give Up incorrect; Try Again: 3 attempts remaining Part B 180.0 mL of 0.11 M C2HsNH2 with 265.0 mL of 0.21 M C2HsNH3Cl Express your answer using two decimal places. pH My Answers Give Up Submit Provide Feedback

Explanation / Answer

Part A)

This is a buffer so

pH = pKa + log(F-/HF)

pKa for HF = 3.14

so

pH = 3.14 + log(0.32/0.25) = 3.2472099

pH = 3.2472099

B)

this is pretty similar, this is a basic buffer

pOH = pKb + log(C2H4NH3+/C2H4NH2)

ethyl amine has a pKb = 3.366531

so

pOH = 3.366531 + log(0.21/0.11)

pH = 14- pOH = 14- 3.64735

pH = 10.35265

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