Yesterday

1
Yesterdays Homework

• Page 611 19
• Page 612 20

2
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• H 1.0 x 10-2
• log H -2
• pH 2

3
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• H 3.0 x 10-6
• log H 0.477 6
• -5.523
• pH 5.523

4
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• OH- 8.2 x 10-6
• log OH- 0.913 6
• -5.087
• pOH 5.087

5
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• pOH 5.087
• pH pOH 14
• pH 14 pOH
• 14 5.087
• 8.913

6
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• OH- 1.0 x 10-6
• log OH- -6
• pOH 6
• pH 14 6
• 8

7
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• OH- 6.5 x 10-4
• log OH- 0.812 - 4
• pOH 3.188
• pH 14 3.188
• 10.812

8
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• H 3.6 x 10-9
• log H 0.556 - 9
• pH 8.444
• pOH 14 8.444
• 5.556

9
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• H .025

10
Calculate the pH of solutions having the
following ion concentrations at 298o K.

• H 2.5 x 10-2
• log H 0.397 2
• pH 1.603
• pOH 14 1.603
• 12.397

11

• Now lets try it the other way around

12
Given the pH, calculate the H and OH- for
the following solution.

• pH 7.40
• -log H 7.40
• log H -7.40
• .60 8
• H 4.0 x 10-8

13
Given the pH, calculate the H and OH- for
the following solution.

• pOH 14 7.40
• 6.60
• log OH- -6.60
• .40 7
• OH- 2.5 x 10-7

14
One last thing

• If you have a solution of 1.0 M HCl, what is the
  H?

15
One last thing

• HCl is a strong acid.
• That means it dissociates completely.
• If HCl 1.0, then H 1.0

16
One last thing

• Same with strong bases.
• If NaOH 1.0, then OH- 1.0

17
Homework

• Page 614
• Problems 21 22