Assessment: Acid-Base Reactions
Answer every question, then submit to see your score and which topics to review.
Part A — Concept Questions
How does Brønsted–Lowry theory define an acid?
MediumA very dilute solution of hydrochloric acid is prepared. Is it still classified as a "strong" acid?
MediumPart B — Formula & Application
A solution has [H⁺] = 1.0 × 10⁻⁵ mol/L. Find its pH.
MediumA solution has [H⁺] = 1.0 × 10⁻⁶ mol/L. What is [OH⁻] at 25°C?
MediumPart C — Problem Solving
A weak acid has Ka = 9.0 × 10⁻⁶ and a starting concentration of 0.40 mol/L. Estimate [H⁺] (mol/L), assuming the ionised amount is small compared to 0.40.
HardA buffer has pKa = 4.74, with [A⁻] = 0.10 mol/L and [HA] = 0.20 mol/L. Find the pH (log₁₀0.5 ≈ −0.30).
HardPart D — Real-Life Application
Ammonium chloride (NH₄Cl), formed from a weak base (NH₃) and a strong acid (HCl), is dissolved in water. Is the resulting solution acidic, basic, or neutral?
MediumPart E — Challenge
A buffer made of acetic acid and sodium acetate has a small amount of strong acid added. What happens?
Hard0/8 answered