Weak Base Calculator
⚖ Acids, Bases & Equilibrium. Use the Weak base formula to find [oh⁻], kb, base concentration: pick the value you want, type the others, and the answer updates as you go.
[OH⁻]0.0013342 mol/L
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 |
|---|---|
| [OH⁻] | mol/L |
| Kb | no unit |
| Base concentration | mol/L |
Worked example
Find the [oh⁻] when Kb = 1.78 × 10⁻⁵, Base concentration = 0.1 mol/L.
Using [OH^-] = √(Kb Cb): [OH⁻] = 0.0013342 mol/L.
Frequently asked questions
What is the formula for Weak base?
[OH^-] = √(Kb Cb).
What do the letters stand for, and what units are used?
[OH⁻] in mol/L, Kb, Base concentration in mol/L.
How do you calculate [oh⁻]?
Put the values into [OH^-] = √(Kb Cb). For example, with Kb = 1.78 × 10⁻⁵, Base concentration = 0.1 mol/L, [oh⁻] = 0.0013342 mol/L.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value ([oh⁻], kb, base concentration) and fill in the others: it rearranges the formula for you.
