Secure 71/quizzes/169043/tak Outcomes People Quizzes D Question 1 Attempt due Ap

Question

Secure 71/quizzes/169043/tak Outcomes People Quizzes D Question 1 Attempt due Apr 10 at 12:40pm 13 Minutes, 31 Seconds 4 pts TJC Library Resources 45.0 mL of 0.75 M HNo, is added to l 50.0 mL of a 0.50 MCsH,N / 0.40 MCsHNr buffer solution. Calculate the diluted concentration of C$H,N Collaborations Order Course Materials- Follett Bookstore McGraw Hil Campus D Question 2 4 pts Collaborate Ultra 45.0 mL of 0.75 MHNO, is added to 150.0 ml of a 0.50 MCH N/0.40 MC,H,NH' buffer solution. Calculate the diluted concentration of H Google Drive TJC Tutoring Class Climate Surveys Course Syllabus D | Question 3 4 pts 45.0 mL of 0.75 M HNO3 is added to 150.0 mL of a 0.50 MC5HsN / 0.40 MC,HAH, buffer solution. Calculate the diluted concentration of CsHsNH D Question 4 4 pts

Explanation / Answer

1)

mmoles of C5H5N = 150 x 0.50 = 75

mmoles of C5H5NH+ = 150 x 0.40 = 60

mmoles of HNO3 added = 45 x 0.75 = 33.75

C5H5NH   --------------> C5H5NH+

75                                    60

- 33.75                            + 33.75

41.25                                93.75

diluted concentration of C5H5N = 41.25 / 150 + 45 = 0.212

diluted concentration of C5H5N = 0.212 M

2)

pH = pKa + log [base / acid]

     = 5.23 + log [41.25 / 93.75]

pH = 4.87

3)

diluted concentration of C5H5NH+ = 93.75 / 150 + 45

diluted concentration of C5H5NH+ = 0.481 M

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