A without doing any calculations would the solubility

This preview shows page 1 - 2 out of 2 pages.

(a) Without doing any calculations, would the solubility of this compound be larger in a p H 4 or a p H 10 buffer? Explain briefly. [5 marks] (b) Calculate the solubility of this compound in a p H 7 buffer. [7 marks] 4. Hydroselenic acid (H 2 Se) has K a ’s of 1 . 3 × 10 - 4 and 1 × 10 - 11 at 25 C. What is the p H of a 0 . 12mol / L solution of hydroselenic acid in water? [10 marks] Bonus: When I originally set this question, I had picked an H 2 Se concentration of 1 . 2 × 10 - 4 mol / L, and then realized that this made the problem much harder. Why? 5. You have been asked to prepare about 500 mL of a p H 9 buffer. Your laboratory reagent shelf includes both ammonium chloride (53.49 g/mol) and 1.5 M ammonia solution. The pK a of the ammonium ion is 9.3. How would you prepare this buffer? [10 marks] 1
Image of page 1

Subscribe to view the full document.

6. As you no doubt know, smokers can be helped to quit by providing them with nicotine by alternative means. One popular class of products are nicotine-containing chewing gums. Unfortunately, while this is an excellent way to deliver nicotine to the body, nicotine tastes absolutely awful. Many popular nicotine gums also contain the sugar
Image of page 2
You've reached the end of this preview.

{[ snackBarMessage ]}

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