B7FCE7F4-C0B7-4302-9BB8-627BCBE1FE51.jpeg - Question 4 1/1 pts A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF The pH of the solution

B7FCE7F4-C0B7-4302-9BB8-627BCBE1FE51.jpeg - Question 4 1/1...

This preview shows page 1 out of 1 page.

Image of page 1

You've reached the end of your free preview.

Want to read the whole page?

Unformatted text preview: Question 4 1/1 pts A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. The pH of the solution [ Select ] while adding solid NaOH. After the addition of 0.100 moles of solid NaOH, the pH of the solution is [ Select ] Assume no volume change upon the addition of base. The Ka for HF is 3.5 x 10-4. Henderson-Hasselbalch equation: pH = pKa + log acid [base] Answer 1: Correct! increases Great job! You got it RIGHT! EXCELLENT Answer 2: Correct! 3.69 Great job! You got it RIGHT! EXCELLENT Hints: 1) When a base (OH") is added to the buffer, the stoichiometric amount of the weak acid is neutralized and converted to its conjugate base. Write a balanced chemical reaction, as shown below, to determine the number of moles of HF and F- present after adding NaOH. Add base: OH (aq) + HA (aq) - H2O(1) + A"(aq) 2) Enter the new number of moles of HF and F- present into the Henderson-Hasselbalch equation, pH = pka + log [base] [acid , to solve for the pH of the new buffer. Click here a to read more about this topic in your textbook....
View Full Document

  • Fall '13

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes