Conjugate Pair Calculator
⚖ Acids, Bases & Equilibrium. Use the Conjugate pair formula to find ka (acid), kb (conjugate base): pick the value you want, type the others, and the answer updates as you go.
Ka (acid)1.739 × 10⁻⁵
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Ka (acid) | no unit |
| Kb (conjugate base) | no unit |
Worked example
Find the ka (acid) when Kb (conjugate base) = 5.75 × 10⁻¹⁰.
Using Ka × Kb = Kw: Ka (acid) = 1.739 × 10⁻⁵.
Frequently asked questions
What is the formula for Conjugate pair?
Ka × Kb = Kw.
What do the letters stand for, and what units are used?
Ka (acid), Kb (conjugate base).
How do you calculate ka (acid)?
Put the values into Ka × Kb = Kw. For example, with Kb (conjugate base) = 5.75 × 10⁻¹⁰, ka (acid) = 1.739 × 10⁻⁵.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (ka (acid), kb (conjugate base)) and fill in the others: it rearranges the formula for you.
