1.What is the conjugate base of H2C2O4? 2.Which of the following acids and bases are weak? HNO3 HF LiOH CH3NH2 H2SO4 3.If a solution contains a hydrogen ion concentration of 6.21 x 10-5 M, what is the [OH-] and is the solution acidic or basic? 4.What is the [H+] of a solution with a pOH of 8.21? 1.What is the conjugate base of H2C2O4? 2.Which of the following acids and bases are weak? HNO3 HF LiOH CH3NH2 H2SO4 3.If a solution contains a hydrogen ion concentration of 6.21 x 10-5 M, what is the [OH-] and is the solution acidic or basic? 4.What is the [H+] of a solution with a pOH of 8.21? 1.What is the conjugate base of H2C2O4? 2.Which of the following acids and bases are weak? HNO3 HF LiOH CH3NH2 H2SO4 3.If a solution contains a hydrogen ion concentration of 6.21 x 10-5 M, what is the [OH-] and is the solution acidic or basic? 4.What is the [H+] of a solution with a pOH of 8.21? Solution 1. The conjugate base of H2C2O4 is HC2O4- 2. Strong acid: HNO3, H2SO4 Strong base: LiOH Weak acid:  HF Weak base: CH3NH2 3. [H+] = 6.21 x 10 -5 M pH = -loh[H+] pH = -log[6.21 x 10 -5 M] pH = 4.20 Now, pOH = 14 - pH pOH = 14 - 4.2 pOH = 9.8 Now, [OH-] = 10 -pOH [OH-] = 10 -9.8 [OH-] = 1.58 x 10 -10 M (acidic solution) 4. pH = 14 - pOH pH = 14 - 8.21 pH = 5.79 [H+] = 10 -pH [H+] = 10 -5.79 [H+] = 1.62 x 10 -6 M .

1. 1.What is the conjugate base of H2C2O4?
2.Which of the following acids and bases are weak?
HNO3 HF LiOH CH3NH2 H2SO4
3.If a solution contains a hydrogen ion concentration of 6.21 x 10-5 M, what is the [OH-] and is
the solution acidic or basic?
4.What is the [H+] of a solution with a pOH of 8.21?
1.What is the conjugate base of H2C2O4?
2.Which of the following acids and bases are weak?
HNO3 HF LiOH CH3NH2 H2SO4
3.If a solution contains a hydrogen ion concentration of 6.21 x 10-5 M, what is the [OH-] and is
the solution acidic or basic?
4.What is the [H+] of a solution with a pOH of 8.21?
1.What is the conjugate base of H2C2O4?
2.Which of the following acids and bases are weak?
HNO3 HF LiOH CH3NH2 H2SO4
3.If a solution contains a hydrogen ion concentration of 6.21 x 10-5 M, what is the [OH-] and is
the solution acidic or basic?
4.What is the [H+] of a solution with a pOH of 8.21?
Solution
1. The conjugate base of H2C2O4 is HC2O4-
2. Strong acid: HNO3, H2SO4
Strong base: LiOH

2. Weak acid:Â Â HF
Weak base: CH3NH2
3.
[H+] = 6.21 x 10 -5
M
pH = -loh[H+]
pH = -log[6.21 x 10 -5
M]
pH = 4.20
Now, pOH = 14 - pH
pOH = 14 - 4.2
pOH = 9.8
Now, [OH-] = 10 -pOH
[OH-] = 10 -9.8
[OH-] = 1.58 x 10 -10 M (acidic solution)
4.
pH = 14 - pOH
pH = 14 - 8.21
pH = 5.79
[H+] = 10 -pH
[H+] = 10 -5.79
[H+] = 1.62 x 10 -6 M