Calculator catalog
Choose a category or search by quantity, component or engineering topic.
Found 25 calculators
pH from [H+] concentration
Calculates pH as −log10([H+]) in the dilute-solution model.
[H+] concentration from pH
Calculates [H+] as 10^(−pH) in the dilute-solution model.
pOH from [OH−] concentration
Calculates pOH as −log10([OH−]) in the dilute-solution model.
[OH−] concentration from pOH
Calculates [OH−] as 10^(−pOH) in the dilute-solution model.
pH and pOH from pKw
Uses pH + pOH = pKw with editable pKw.
KA and pKa
Converts the acid dissociation constant and its negative decimal logarithm.
KB and pKb
Converts the base dissociation constant and its negative decimal logarithm.
Henderson–Hasselbalch equation
Calculates an acidic buffer pH from pKa and [A−]/[HA].
Basic acidic buffer
Calculates HA/A− buffer pH from Ka and both form concentrations.
Basic alkaline buffer
Calculates B/BH+ buffer pOH and pH from Kb, pKw, and both form concentrations.
Dilution C1V1 = C2V2
Calculates a simple solution dilution from conservation of concentration times volume.
Moles from mass and molar mass
Calculates amount of substance from mass and molar mass.
Mass from moles and molar mass
Calculates mass from amount of substance and molar mass.
Mole fraction
Calculates helper mole fraction from user-provided component moles and total moles.
Molality
Calculates molality as moles of solute per kilogram of solvent.
Normality with manual equivalent factor
Calculates normality from molarity and a manually supplied equivalent factor.
Equivalent mass
Calculates equivalent mass in g/eq or kg/eq from molar mass and a manually supplied equivalent factor.
Serial dilution
Calculates the overall factor and concentration after a whole number of repeated dilution stages.
Minimum dilution-stage count
Calculates the smallest whole number of stages required to reach a concentration no greater than the target.
Basic stoichiometric titration
Calculates C2 from C1·V1·n1 = C2·V2·n2.
Beer–Lambert law
Calculates absorbance A from molar absorptivity ε, optical path length l, and molar concentration c.
Osmotic pressure
Calculates osmotic pressure from the van ’t Hoff equation for an ideal dilute solution.
Simple Raoult law
Calculates solvent partial pressure as its mole fraction times the pure-solvent vapour pressure.
Freezing-point depression
Calculates freezing-point depression from molality, the cryoscopic constant, and the van ’t Hoff factor.
Boiling-point elevation
Calculates boiling-point elevation from molality, the ebullioscopic constant, and the van ’t Hoff factor.