Chemistry calculators

Moles, concentrations, and stoichiometry — step by step.

Solution concentration, dilution, and reaction math — with careful unit handling and explanations of the underlying relationships.

Calculators

258

Topics: All Solutions (54) Reactions (19)

Chemistry / Solutions

ppm to Molarity Conversion Calculator

Convert a parts-per-million concentration of a solute (assumed numerically equal to mg/L in dilute aqueous solutions) to...

basic

2,505 4.2 1 min

Chemistry

Bond Enthalpy of Reaction from Bond Energies Calculator

Estimate the standard reaction enthalpy from average bond energies: ΔH_rxn ≈ Σ(bonds broken) − Σ(bonds formed). Enter th...

basic

2,231 4.7 1 min

Chemistry

Buffer A⁻/HA Ratio from Target pH Calculator

Inverse Henderson-Hasselbalch: given a target buffer pH and the acid pKa, compute the required [A⁻]/[HA] ratio (and the...

basic

2,088 3.9 1 min

Chemistry

Specific Rotation and Optical Activity Calculator

Converts observed optical rotation α into specific rotation [α] using the formula [α] = α / (l · c), where l is the path...

basic

23,887 4.0 1 min

Chemistry / Solutions

Mass Fraction to Molality Conversion Calculator

Convert the mass fraction of a solute w (g solute / g solution) to molality b = w / (M_solute × (1 − w)), with M in kg/m...

basic

22,851 3.9 1 min

Chemistry

Salt Solution pH Classifier

Predict whether a salt produces an acidic, basic, or neutral solution by inputting the strength of the parent acid and p...

basic

22,459 4.0 1 min

Chemistry

Bond Order from MO Theory Calculator

Compute the molecular-orbital bond order from the number of electrons in bonding and antibonding orbitals: BO = (n_bondi...

basic

21,782 4.1 1 min

Chemistry / Solutions

Molality to Molarity Conversion Calculator

Convert solute molality (mol per kg of solvent) into molarity (mol per L of solution) given the solution density and the...

basic

21,316 4.5 1 min

Chemistry

Nernst Equation Electrode Potential Calculator

Calculates the actual electrode potential using the Nernst equation from standard reduction potential, temperature, numb...

basic

21,139 3.9 1 min

Chemistry

Latent Heat of Fusion Energy Calculator

Compute the energy Q required to melt a substance at its melting point from the mass and the substance-specific latent h...

basic

20,941 4.5 1 min

Chemistry

Ester Yield from Acid and Alcohol Moles Calculator

Calculates the theoretical mass of ester produced and the percentage yield from an esterification reaction, assuming aci...

basic

20,387 4.1 1 min

Chemistry / Solutions

Molality from Moles of Solute and Mass of Solvent Calculator

Calculates molality m = n_solute / mass_solvent (kg). Used in colligative property calculations where mass-based concent...

basic

17,552 3.9 1 min

Chemistry

Compressibility Factor Z from Real-Gas P, V, n, T Calculator

Compute the compressibility factor Z = PV / (nRT) for a real gas given pressure (atm), volume (L), moles, and temperatur...

basic

15,116 3.9 1 min

Chemistry

Gas Stoichiometry: Volume from Moles at STP Calculator

Compute the volume occupied by a given number of moles of an ideal gas at standard temperature and pressure (STP): V = n...

basic

14,803 4.5 1 min

Chemistry

Percent Recovery from Extraction Calculator

Compute the percent recovery of a substance from a purification or extraction step from the recovered (final) mass and t...

basic

14,256 4.5 1 min

Chemistry

Half-Life of a Zero-Order Reaction Calculator

Compute the half-life of a zero-order reaction A → products from the rate constant k (M·s⁻¹) and initial concentration [...

basic

13,128 4.8 1 min

Chemistry / Solutions

PPM and PPB Concentration Calculator

Convert the mass of a solute (in mg) per mass or volume of solution into parts-per-million (ppm) and parts-per-billion (...

basic

11,245 4.4 1 min

Chemistry

Dalton's Law Partial Pressure Calculator

Calculates partial pressures for up to four gas components in a mixture using Dalton's Law and mole fractions.

basic

11,152 4.8 1 min

Chemistry / Solutions

Freezing Point Depression Calculator

Calculates freezing point depression for a solution from van't Hoff factor, cryoscopic constant, and molality.

basic

9,804 4.7 1 min

Chemistry

Isotopic Average Atomic Mass Calculator

Compute the average atomic mass of an element from up to four isotopes' masses and natural abundances: M_avg = Σ (abunda...

basic

5,301 3.9 1 min

Chemistry

pKb from pKa Conversion Calculator

Convert a weak acid's pKa to the corresponding pKb of its conjugate base (or vice-versa) using the relation pKa + pKb =...

basic

4,596 5.0 1 min

Chemistry

First-Order Reaction Half-Life Calculator

Compute the half-life of a first-order reaction directly from its rate constant: t½ = ln 2 / k = 0.693 / k. The half-lif...

basic

4,517 4.3 1 min

Chemistry

Theoretical (Stoichiometric) Combustion Air for a Fuel Calculator

Compute the theoretical (stoichiometric) mass of air required to completely combust 1 kg of a solid or liquid fuel from...

basic

2,267 4.5 1 min

Chemistry

Enthalpy of Vaporisation from Two Temperature–Pressure Points Calculator

Solves the integrated Clausius–Clapeyron equation: ln(P₂/P₁) = −ΔH_vap/R × (1/T₂ − 1/T₁) for ΔH_vap in kJ/mol.

basic

1,908 4.3 1 min

Showing 25 to 48 of 258 results

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Solution concentration, dilution, and reaction math — with careful unit handling and explanations of the underlying relationships.

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Chemistry calculators

ppm to Molarity Conversion Calculator

Bond Enthalpy of Reaction from Bond Energies Calculator

Buffer A⁻/HA Ratio from Target pH Calculator

Specific Rotation and Optical Activity Calculator

Mass Fraction to Molality Conversion Calculator

Salt Solution pH Classifier

Bond Order from MO Theory Calculator

Molality to Molarity Conversion Calculator

Nernst Equation Electrode Potential Calculator

Latent Heat of Fusion Energy Calculator

Ester Yield from Acid and Alcohol Moles Calculator

Molality from Moles of Solute and Mass of Solvent Calculator

Compressibility Factor Z from Real-Gas P, V, n, T Calculator

Gas Stoichiometry: Volume from Moles at STP Calculator

Percent Recovery from Extraction Calculator

Half-Life of a Zero-Order Reaction Calculator

PPM and PPB Concentration Calculator

Dalton's Law Partial Pressure Calculator

Freezing Point Depression Calculator

Isotopic Average Atomic Mass Calculator

pKb from pKa Conversion Calculator

First-Order Reaction Half-Life Calculator

Theoretical (Stoichiometric) Combustion Air for a Fuel Calculator

Enthalpy of Vaporisation from Two Temperature–Pressure Points Calculator