Acid Strength, Conjugate Pairs & Ka — Drills · Grade 11 Science
Chapter: Acids, Bases & TitrationWhat these drills covers
By the end of Acid Strength, Conjugate Pairs & Ka you should be able to:
- I can identify conjugate pairs and distinguish strength from concentration.
- I can estimate weak-acid ionization and check a simplifying assumption.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: conjugate pair, Ka, pKa.
Problem 1
Ka=10⁻⁶. Find pKa.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
6
−log 10(10⁻⁶)=6.
Problem 2
Does strong mean concentrated?
Answer and explanation
No. Strong concerns fraction ionized; concentrated concerns amount per volume.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.