Q. What is the pH of a buffer solution containing 0.2 M acetic acid and 0.1 M sodium acetate?
-
A.
4.76
-
B.
5.00
-
C.
5.74
-
D.
6.00
Solution
Using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]) = 4.76 + log(0.1/0.2) = 5.74
Correct Answer: C — 5.74
Learn More →
Q. What is the pH of a buffer solution made from 0.2 M acetic acid and 0.2 M sodium acetate?
-
A.
4.76
-
B.
5.76
-
C.
6.76
-
D.
7.76
Solution
Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]) = 4.76.
Correct Answer: A — 4.76
Learn More →
Q. What is the pH of a solution formed by mixing equal volumes of 0.1 M HCl and 0.1 M NaOH?
Solution
HCl and NaOH neutralize each other completely, resulting in a neutral solution with a pH of 7.
Correct Answer: A — 7
Learn More →
Q. What is the pH of a solution that has a hydrogen ion concentration of 1 x 10^-5 M?
Solution
pH is calculated as pH = -log[H+]. For [H+] = 1 x 10^-5 M, pH = -log(1 x 10^-5) = 5.
Correct Answer: A — 5
Learn More →
Q. What is the pH of a solution that has a hydronium ion concentration of 1 x 10^-5 M?
Solution
pH is calculated as pH = -log[H3O+]. For [H3O+] = 1 x 10^-5 M, pH = -log(1 x 10^-5) = 5.
Correct Answer: A — 5
Learn More →
Q. What is the pH of a solution that has a hydroxide ion concentration of 1.0 x 10^-3 M?
Solution
pOH = -log[OH-] = -log(1.0 x 10^-3) = 3. Therefore, pH = 14 - pOH = 14 - 3 = 11.
Correct Answer: A — 11
Learn More →
Q. What is the pH of a solution that has a [H+] concentration of 1 x 10^-7 M?
Solution
pH = -log[H+] = -log(1 x 10^-7) = 7.
Correct Answer: A — 7
Learn More →
Q. What is the pH of a solution that is 0.1 M in both acetic acid and sodium acetate?
-
A.
4.76
-
B.
5.76
-
C.
6.76
-
D.
7.76
Solution
Using Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]); pKa of acetic acid = 4.76, so pH = 4.76 + log(1) = 4.76
Correct Answer: A — 4.76
Learn More →
Q. What is the pH of a solution with a hydroxide ion concentration of 0.001 M?
Solution
pOH = -log[OH-] = -log(0.001) = 3; pH = 14 - pOH = 14 - 3 = 11
Correct Answer: B — 12
Learn More →
Q. What is the pH of a solution with a hydroxide ion concentration of 1.0 x 10^-4 M?
Solution
To find the pH, first calculate pOH = -log[OH-] = 4, then use pH + pOH = 14, so pH = 14 - 4 = 10.
Correct Answer: A — 10
Learn More →
Q. What is the pH of a solution with [H+] = 1 x 10^-6 M?
Solution
Using the formula pH = -log[H+], we find pH = -log(1 x 10^-6) = 6.
Correct Answer: A — 6
Learn More →
Q. What is the primary reason for the formation of a precipitate in a saturated solution?
-
A.
Excess solute
-
B.
Temperature increase
-
C.
Change in pH
-
D.
Decrease in solubility product
Solution
A precipitate forms when the ionic product exceeds the solubility product (Ksp) of the salt.
Correct Answer: D — Decrease in solubility product
Learn More →
Q. What is the primary reason for the increase in pH when a weak acid is titrated with a strong base?
-
A.
Formation of water
-
B.
Neutralization of acid
-
C.
Formation of a conjugate base
-
D.
All of the above
Solution
All of the above factors contribute to the increase in pH during the titration of a weak acid with a strong base.
Correct Answer: D — All of the above
Learn More →
Q. What is the primary species present in a solution of acetic acid (CH3COOH)?
-
A.
CH3COO-
-
B.
H+
-
C.
CH3COOH
-
D.
H2O
Solution
In a solution of acetic acid, the primary species present is the undissociated acetic acid (CH3COOH), along with some dissociated ions.
Correct Answer: C — CH3COOH
Learn More →
Q. What is the primary species present in a solution of sodium acetate (CH3COONa)?
-
A.
CH3COO-
-
B.
Na+
-
C.
H+
-
D.
OH-
Solution
In a solution of sodium acetate, the acetate ion (CH3COO-) is the primary species that affects the pH.
Correct Answer: A — CH3COO-
Learn More →
Q. What is the relationship between Ka and Kb for a conjugate acid-base pair?
-
A.
Ka + Kb = Kw
-
B.
Ka * Kb = Kw
-
C.
Ka - Kb = Kw
-
D.
Ka / Kb = Kw
Solution
For a conjugate acid-base pair, the relationship is Ka * Kb = Kw, where Kw is the ion product of water.
Correct Answer: B — Ka * Kb = Kw
Learn More →
Q. What is the relationship between pKa and Ka for a weak acid?
-
A.
pKa = -log(Ka)
-
B.
pKa = log(Ka)
-
C.
pKa = Ka
-
D.
pKa = 1/Ka
Solution
The relationship is given by the equation pKa = -log(Ka), where Ka is the acid dissociation constant.
Correct Answer: A — pKa = -log(Ka)
Learn More →
Q. What is the relationship between pKa and Ka for an acid?
-
A.
pKa = -log(Ka)
-
B.
pKa = log(Ka)
-
C.
pKa = Ka
-
D.
pKa = 1/Ka
Solution
The relationship is given by the formula pKa = -log(Ka), where Ka is the acid dissociation constant.
Correct Answer: A — pKa = -log(Ka)
Learn More →
Q. What is the relationship between pKa and Ka?
-
A.
pKa = -log(Ka)
-
B.
pKa = log(Ka)
-
C.
pKa = Ka
-
D.
pKa = 1/Ka
Solution
The relationship is given by pKa = -log(Ka), where Ka is the acid dissociation constant.
Correct Answer: A — pKa = -log(Ka)
Learn More →
Q. Which of the following acids is a weak acid?
-
A.
HCl
-
B.
H2SO4
-
C.
CH3COOH
-
D.
HNO3
Solution
Acetic acid (CH3COOH) is a weak acid, while HCl, H2SO4, and HNO3 are strong acids.
Correct Answer: C — CH3COOH
Learn More →
Q. Which of the following ions will cause the precipitation of AgCl from a solution of AgNO3?
-
A.
Na+
-
B.
Cl-
-
C.
NO3-
-
D.
K+
Solution
Cl- ions will react with Ag+ ions from AgNO3 to form AgCl, which is insoluble in water and will precipitate out.
Correct Answer: B — Cl-
Learn More →
Q. Which of the following ions will cause the precipitation of BaSO4 from a solution of barium chloride?
-
A.
Na+
-
B.
Cl-
-
C.
SO4^2-
-
D.
K+
Solution
The presence of SO4^2- ions will react with Ba2+ ions to form insoluble BaSO4, causing precipitation.
Correct Answer: C — SO4^2-
Learn More →
Q. Which of the following ions will cause the precipitation of silver chloride (AgCl) from a solution?
-
A.
Na+
-
B.
Cl-
-
C.
Ag+
-
D.
K+
Solution
Cl- ions will react with Ag+ ions to form the insoluble salt AgCl, causing precipitation.
Correct Answer: B — Cl-
Learn More →
Q. Which of the following ions will increase the acidity of a solution?
-
A.
Na+
-
B.
Cl-
-
C.
NH4+
-
D.
K+
Solution
NH4+ is the conjugate acid of a weak base (NH3) and will increase the acidity of the solution.
Correct Answer: C — NH4+
Learn More →
Q. Which of the following is a characteristic of a buffer solution?
-
A.
It changes pH drastically with small amounts of acid or base
-
B.
It resists changes in pH
-
C.
It has a pH of 7
-
D.
It can only be made from strong acids and bases
Solution
A buffer solution is designed to resist changes in pH when small amounts of acid or base are added.
Correct Answer: B — It resists changes in pH
Learn More →
Q. Which of the following is a strong base?
-
A.
NH4OH
-
B.
NaOH
-
C.
CH3COONa
-
D.
K2CO3
Solution
NaOH (sodium hydroxide) is a strong base that completely dissociates in solution.
Correct Answer: B — NaOH
Learn More →
Q. Which of the following is true about a buffer solution?
-
A.
Resists changes in pH
-
B.
Has a pH of 7
-
C.
Contains only strong acids
-
D.
Is always neutral
Solution
A buffer solution resists changes in pH upon the addition of small amounts of acid or base.
Correct Answer: A — Resists changes in pH
Learn More →
Q. Which of the following salts will produce a basic solution when dissolved in water?
-
A.
NaCl
-
B.
KNO3
-
C.
NH4Cl
-
D.
Na2CO3
Solution
Na2CO3 is a salt of a weak acid (H2CO3) and a strong base (NaOH), thus it will produce a basic solution.
Correct Answer: D — Na2CO3
Learn More →
Q. Which of the following statements about strong acids is true?
-
A.
They partially dissociate in solution
-
B.
They completely dissociate in solution
-
C.
They have high pKa values
-
D.
They do not conduct electricity
Solution
Strong acids completely dissociate in solution, producing a high concentration of H+ ions, which allows them to conduct electricity.
Correct Answer: B — They completely dissociate in solution
Learn More →
Q. Which of the following statements about the common ion effect is true?
-
A.
It increases solubility
-
B.
It decreases solubility
-
C.
It has no effect on solubility
-
D.
It only applies to strong electrolytes
Solution
The common ion effect states that the solubility of a salt decreases in the presence of a common ion.
Correct Answer: B — It decreases solubility
Learn More →
Showing 31 to 60 of 64 (3 Pages)