Calculators

Chemistry calculators

6 tools

Amount of substance, solutions, and acid-base pH.

Henderson–Hasselbalch Calculator Compute buffer pH = pKa + log10([A−]/[HA]). Accepts pKa or Ka. Runs locally. Not ICE equilibrium and not pH = −log10[H+].
Molarity Calculator Compute molarity c = n/V and dilution C1·V1 = C2·V2. Runs locally. Not mole n=m/M and not Henderson–Hasselbalch.
Mole Calculator Compute amount n = m/M and particle count N = n·N_A. N_A is CODATA 2018 exact. Runs locally. Not molarity and not Henderson–Hasselbalch.
pH Calculator Compute pH = −log10[H+] and pOH = −log10[OH−] at 25 °C with Kw = 1e-14. Runs locally. Not Henderson–Hasselbalch and not ICE.
Weak-Acid Equilibrium Calculator Solve monoprotic weak-acid ICE from formal C and Ka or pKa. Charge and mass balance; optional water at 25 °C. Runs locally. Not Henderson–Hasselbalch and not pH = −log10[H+] identities.
Weak-Base Equilibrium Calculator Solve monoprotic weak-base ICE from formal C and Kb or pKb. Charge and mass balance; optional water at 25 °C. Runs locally. Not Henderson–Hasselbalch and not weak-acid ICE.