pH Calculations Gchem.notebook
April 27, 2016
Review
1. What is the formula for a hydronium ion?____ hydroxide? ___
2. a.Write the dissociation equation for water:
b. What is the Kw for water? __________
3. In an acidic solution:
a. the pH is ___________ (range)
b. Which has a higher concentration: hydronium or hydroxide?
4. In an alkaline solution:
a. the pH is ___________ (range)
b. Which has a higher concentration: H3O+1 or OH­1?
5. What is the factor in concentration (M) between each pH unit?
Apr 27­8:19 AM
1
pH Calculations Gchem.notebook
April 27, 2016
Review
1. What is the formula for a hydronium ion?____ hydroxide? ___
2. a.Write the dissociation equation for water:
b. What is the Kw for water? __________
3. In an acidic solution:
a. the pH is ___________ (range)
b. Which has a higher concentration: hydronium or hydroxide?
4. In an alkaline solution:
a. the pH is ___________ (range)
b. Which has a higher concentration: H3O+1 or OH­1?
5. What is the factor in concentration (M) between each pH unit?
Apr 27­8:19 AM
2
pH Calculations Gchem.notebook
April 27, 2016
pH = ­log[H3O+1]
[H3O+1] = 10­pH
­ Log H3O+ or H30+ Log ­
2nd Log ­ pH or pH ­ 2nd Log pOH = ­log[OH­1]
[OH­1] = 10­pOH
.
pH + pOH = 14
[H3O+1] [OH­1] = 1 x 10­14 a. Identify equation. b. Solve.
A solution has:
1. pOH = 7
2. pOH = 9.5 answer?
pH = 7
pH + pOH = 14
equation?
answer?
pH = 4.5
pH + pOH = 14
equation?
3. [OH­1] = 1.0 x 10­6M pOH = 6answer?
pOH = ­log[OH
equation? ­1]
4. [H3O+1] = 1.5 x 10­4 pH = 3.8
answer?
pH = ­log[H3O+1]
equation?
Apr 13­10:12 AM
3
pH Calculations Gchem.notebook
April 27, 2016
pH = ­log[H3O+1]
[H3O+1] = 10­pH
­ Log H3O+ or H30+ Log ­
2nd Log ­ pH or pH ­ 2nd Log pOH = ­log[OH­1]
[OH­1] = 10­pOH
.
pH + pOH = 14
[H3O+1] [OH­1] = 1 x 10­14 a. Identify equation. b. Solve.
A solution has:
1. pOH = 7
2. pOH = 9.5 pH = 7
pH + pOH = 14
pH = 4.5
answer?
equation?
answer?
pH + pOH = 14
equation?
3. [OH­1] = 1.0 x 10­6M pOH = 6
answer?
pOH = ­log[OH­1]
4. [H3O+1] = 1.5 x 10­4 pH = 3.8
pH = ­log[H3O+1]
equation?
answer?
equation?
Apr 13­10:12 AM
4
pH Calculations Gchem.notebook
April 27, 2016
pH = ­log[H3O+1]
[H3O+1] = 10­pH
­ Log pH or pH Log ­
2nd Log ­ pH or pH ­ 2nd Log pOH = ­log[OH­1]
[OH­1] = 10­pOH
.
pH + pOH = 14
1. pH = 7
[H3O+1] [OH­1] = 1 x 10­14 ­7M
answer?
[H3O+1] = 1.0 x 10
[H3O ] = 10
equation?
+1
2. pOH = 5.5
­pH
­6M
answer?
[OH­] = 3.2 x 10
[OH­1] = 10­pOH
equation?
answer?
­10M
3. [H3O+1] = 1.0 x 10­4M [OH­] = 1.0 x 10
.
+1
­1
­14
[H
3O ] [OH ] = 1 x 10 equation?
H30+ = H+
­10M answer?
4. [H+] = 2.8 x 10­5 M [OH­] = 3.6 x 10
.
[H3equation?
O+1] [OH­1] = 1 x 10­14 Apr 13­10:12 AM
5
pH Calculations Gchem.notebook
April 27, 2016
pH = ­log[H3O+1]
[H3O+1] = 10­pH
­ Log pH or pH Log ­
2nd Log ­ pH or pH ­ 2nd Log pOH = ­log[OH­1]
[OH­1] = 10­pOH
.
pH + pOH = 14
1. pH = 7
[H3O+1] [OH­1] = 1 x 10­14 [H3O+1] = 1.0 x 10­7M
[H3O+1] = 10­pH
2. pOH = 5.5
answer?
equation?
[OH­] = 3.2 x 10­6M
answer?
equation?
[OH­1] = 10­pOH
3. [H3O+1] = 1.0 x 10­4M [OH­] = 1.0 x 10­10M
[H3O
+1
. ] = 1 x 10
] [OH
­1
­14
answer?
equation?
H30+ = H+
4. [H+] = 2.8 x 10­5 M [OH­] = 3.6 x 10­10M [H3O
+1
. ] = 1 x 10
] [OH
­1
­14
answer?
equation?
Apr 13­10:12 AM
6