pKb Calculator
Find pKb from a Kb value, from the conjugate acid's pKa, or from base concentration and [OH⁻]. Shows Kb, Ka and pKa with an adjustable pKw.
Chemistry Reference
5 tools
Which Chemistry Reference tool do you need?
| Tool | What it answers |
|---|---|
| Atom Economy Calculator | Atom economy is the mass of the desired product divided by the total mass of all reactants, times 100, using molar masses multiplied by their balanced-equation coefficients. |
| Formula Weight Calculator | Formula weight is the sum of the atomic weights of every atom in one formula unit. |
| Molecular Mass Calculator | Molecular mass is the sum of the atomic weights of every atom in the formula. |
| pKa Calculator | pKa is the negative base-10 logarithm of the acid dissociation constant: pKa = −log10(Ka). |
| pKb Calculator | pKb is the negative base-10 logarithm of the base dissociation constant: pKb = −log₁₀(Kb). |
All tools
Atom Economy Calculator
Find the atom economy of a reaction from product and reactant molar masses and coefficients, with by-product mass and a step-by-step working.
pKa Calculator
Convert an acid dissociation constant Ka to pKa, or back out pKa from a buffer's pH and its base-to-acid ratio. Ka 1.8 × 10⁻⁵ gives pKa 4.74.
Molecular Mass Calculator
Type a chemical formula such as Ca3(PO4)2 or CuSO4·5H2O and get its molar mass in g/mol, with each element's atom count and mass share.
Formula Weight Calculator
Type a chemical formula with brackets or hydrate dots and get its formula weight in g/mol, with an element-by-element mass breakdown from IUPAC weights.