(3 pt ea) For the following compounds;

a. Show the balanced reaction expected with the given screening reagent.
b. The expected visible observation (ppt, color, effervescence, odor, etc.)
c. If no visible reaction is expected, just write N.R.

2. sodium phosphate and silver nitrate

3. potassium carbonate and cold con. sulfuric acid

4. sodium iodide and barium chloride

5. sodium acetate and warm con. sulfuric acid

6. potassium chloride and cold, con. sulfuric acid

7. potassium sulfate and cold con. sulfuric acid

(2 pt ea) In the specific ion tests, which anion results in:

8. _____red color with Fe+3

9. _____brown color extracted by CCl4 from chlorine water

10. _____brown ring above H2SO4 layer on adding FeSO4 solution

11. _____blue color extracted into butyl cellosolve from H2O2/HNO3

12. _____yellow ppt with ammonium molybdate

13. _____white ppt with AgNO3, insoluble in HCl

14. _____turbidity with clear saturated Ba(OH)2 solution

(3 pt ea) The following are dissolved in water. Label the solutions as acidic, basic or neutral (A,B,N). Show the reaction, (if any), responsible for the pH effect.


15. _____KCl

16. _____KC2H3O2

17. _____NH4NO3

18. _____MgO

19. _____NO2

20. _____FeCl3

21. (8 pt) What is the pH of a 0.10 M solution of HF in water? Ka = 6.9 x 10-4
(Show all work. Assume [0.1-x] = [0.1] to simplify calculations)

22. (9 pt) If solid NaF is added to a 0.10 M HF solution such that it is made 0.10 M in fluoride ion, what is the pH now? (Assume the HF is still 0.10 M after addition of the solid) (Note: this is a buffer, although somewhat hazardous)

23. (8 pt) Derive the value of the hydrolysis constant for NaF from
Kw = 1.0 x 10-14 and Ka (for HF) = 6.9 x 10-4 (Show all steps)

24. (8 pt) What is the pH of the above 0.10 M solution of NaF in water?

25. (5 pt) Reaction rates increase with temperature and concentration. From collision theory, explain why this is true. How does activation energy figure into this? (Possibly some diagrams would be helpful, use back of page)