DAT DAT - Dental Admission General Chemistry: Acid-Base Chemistry 1 — Questions and Answers
Question 1: What is the pH of a solution where [H⁺] = 1 × 10⁻³ M?
- 3 (Correct answer)
- 11
- 7
- 1
Correct answer: 3
pH = -log[H⁺] = -log(10⁻³) = 3.
Question 2: According to the Brønsted-Lowry definition, an acid is a substance that:
- Accepts a proton
- Donates a proton (Correct answer)
- Donates an electron pair
- Accepts an electron pair
Correct answer: Donates a proton
A Brønsted-Lowry acid is defined as a proton (H⁺) donor.
Question 3: When H₂CO₃ donates one proton, its conjugate base is:
- H₃O⁺
- CO₃²⁻
- HCO₃⁻ (Correct answer)
- OH⁻
Correct answer: HCO₃⁻
Removing one proton from H₂CO₃ produces its conjugate base HCO₃⁻ (bicarbonate ion).
Question 4: A strong acid in aqueous solution:
- Partially dissociates
- Does not dissociate
- Completely dissociates (Correct answer)
- Forms a buffer with water
Correct answer: Completely dissociates
Strong acids dissociate completely in water, releasing all available H⁺ ions into solution.
Question 5: What is the pOH of a solution where [OH⁻] = 1 × 10⁻⁵ M?
- 5 (Correct answer)
- 9
- 7
- 14
Correct answer: 5
pOH = -log[OH⁻] = -log(10⁻⁵) = 5.
Question 6: At 25°C, the sum of pH and pOH for any aqueous solution equals:
- 7
- 1
- 14 (Correct answer)
- 10
Correct answer: 14
At 25°C, Kw = [H⁺][OH⁻] = 1 × 10⁻¹⁴, therefore pH + pOH = 14.
DAT DAT - Dental Admission General Chemistry: Acid-Base Chemistry 1
What is the pH of a solution where [H⁺] = 1 × 10⁻³ M?