2. Answer each question on your paper. You may quietly ask a neighbor for help. Each correct answer is worth 5 pts. The last row is worth 6 pts each. Bonus 1 pt. if you notice the Musketeer. SILENTLY write +1 on the square.

3. Mental MathConjugate Acid/Base Pairs pH and pOHAuto- ionization of Water Strength of Acids Salt Solutions 1 44444 1111 555555 2 3 2 3 2 3 222 1 333 4

4. Mental Math - 1 What is the pH of a solution if the hydrogen ion concentration is 1 x 10 -6 M? BACK 6.0

5. Mental Math - 2 What is [H + ] if the pH is 2.0? BACK [H + ] = 1 x 10 -2

6. Mental Math - 3 What is the estimated pH of a solution with [H + ] = 5 x 10 -4 M? BACK pH = 3-4

7. Mental Math - 4 What is the pH of a solution with [OH  ] = 5 x 10 -4 M? BACK pOH = 3-4 pH = 10-11

8. Mental Math - 5 What is the pH range of an aqueous solution if [H 3 O + ] = 0.0037 M BACK pH = 2-3

9. Conjugate Acid/Base - 1 Identify conjugate acid/base pairs for the reaction: BACK HCl + NH 3  NH 4 + + Cl – Acid base conj. acid conj. base

10. Conjugate Acid/Base - 2 Identify conjugate acid/base pairs for the reaction: BACK HF + H 2 O  H 3 O + + F – Acidbaseconj. acid conj. base

11. Conjugate Acid/Base - 3 Identify conjugate acid/base pairs for the reaction: BACK CH 3 NH 2 + H 2 O  CH 3 NH 3 + + OH - Base acidconj. acid conj. base

12. Conjugate Acid/Base - 4 Which is NOT a conjugate acid/base pair? a)HNO 2 and NO 2  b)NH 3 and NH 4 + c)HCl and ClO  BACK c) HCl and ClO 

13. Which IS a conjugate acid/base pair? a)CN  and HCN b)H 2 O and HCO 2 H c)S  and SO 4 2- BACK Conjugate Acid/Base - 5 a)CN  and HCN

14. pH and pOH - 1 What is the formula for pH? BACK pH = -log[H + ]

15. pH and pOH - 2 What is the formula for pOH? BACK pOH = -log[OH  ]

16. pH and pOH - 3 **From the real show** Being amphoteric, ammonia likes to react with either of these, the 2 types of substances on the pH scale BACK acid and base

17. pH and pOH- 4 What is the pH of a 0.05 M solution of HCl? K a = very large BACK pH = -log[H + ] = -log[0.05] = 1.3

18. pH and pOH- 5 What is the pH of a 0.05 M solution of Ba(OH) 2 ? K a = very large BACK pOH = -log[OH  ] = -log[0.05x2] = 1.0 pH = 14 – pOH = 13.0

19. Auto-Ionization of Water - 1 What is the chemical equation for the auto-ionization of water? BACK

20. Auto-Ionization of Water - 2 What is the expression for the equilibrium constant for the auto-ionization of water? BACK K w = [H 3 O + ][OH - ] = 1 x 10 -14 (at 25°C)

21. Auto-Ionization of Water - 3 What is the relationship between K w, K a and K b ? BACK K w = K a x K b

22. Auto-Ionization of Water - 4 If the K a for HF is 7.2 x 10 -4, what is the K b for F  ? BACK K b = 1.4 x 10 -11

23. Auto-Ionization of Water - 5 If the K b for NH 3 is 1.8 x 10 -5, what is the K a for NH 4 + ? BACK K a = 5.6 x 10 -10

24. Strength of Acids - 1 BACK Which is NOT a strong acid? a)HNO 3 b)H 3 PO 4 c)H 2 SO 4 d)HClO 4 b) H 3 PO 4

25. Strength of Acids - 2 BACK Which is NOT a strong acid? a)Ca(OH) 2 b)Ba(OH) 2 c)Be(OH) 2 d)Sr(OH) 2 c) Be(OH) 2

26. Strength of Acids - 3 BACK Which is the stronger acid: HOCN, K a = 3.5 x 10 -4 or HCN, K a = 4.9 x 10 -10 HOCN, K a = 3.5 x 10 -4

27. Strength of Acids - 4 BACK Which is the strongest acid and why? HF, HCl, HBr, HI HI. I is the largest atom, so has the weakest Coulombic attraction with H, and donates H more easily.

28. Strength of Acids - 5 BACK Order from weakest to strongest acid: HClO, HIO, HClO 3, HIO 2 HIO, HClO, HIO 2, HClO 3

29. Salt solutions - 1 How would the addition of NaNO 2 to distilled water affect the pH? BACK Increase (more basic)

30. Salt solutions - 2 BACK No change (neutral) How would the addition of LiBr to distilled water affect the pH?

31. Salt solutions - 3 How would the addition of NH 4 NO 3 to distilled water affect the pH? BACK Decrease (more acidic)

32. Salt solutions - 4 BACK Write the hydrolysis reaction for NH 4 NO 3 (aq). NH 4 + + H 2 O(l)  NH 3 (aq) + H 3 O +

33. Salt solutions - 5 Write the hydrolysis reaction for NaNO 2 (aq). BACK NO 2  + H 2 O(l)  HNO 2 (aq) + OH 