PKa — Science definition
Negative base-ten logarithm of Ka.
Where it is taught
- Acid Strength, Conjugate Pairs & Ka — Acids, Bases & Titration, Physical Science: Chemistry, Grade 11
Questions using 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
Find pKa for Ka=10⁻⁴.
Hints
List the given quantities, select a relationship, and check units before substituting.
Answer and explanation
4
−log 10(10⁻⁴)=4.