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

Half-Cell EMF from Standard Reduction Potentials (Nernst) Calculator

Calculates the standard cell potential E°_cell = E°_cathode − E°_anode and corrects for concentration using the Nernst e...

basic

14,678 4.5 1 min

Chemistry

Water Hardness from Ca²⁺ and Mg²⁺ Calculator

Compute total water hardness expressed as mg/L of CaCO₃ from calcium (mg/L) and magnesium (mg/L) measurements: Hardness...

basic

14,408 4.4 1 min

Chemistry

Weak-Acid ICE Table Calculator

Solve the Initial-Change-Equilibrium (ICE) table for a weak monoprotic acid HA ⇌ H⁺ + A⁻ exactly using the quadratic for...

basic

11,181 4.3 1 min

Chemistry

Radiocarbon Decay Age Estimation Calculator

Estimates the age of an organic sample from its remaining C-14 activity as a fraction of the original, using the radioca...

basic

10,947 4.5 1 min

Chemistry

Weak Acid pH from Ka Calculator

Calculates the pH of a weak acid solution from its acid dissociation constant Ka and initial concentration using the equ...

basic

10,706 4.8 1 min

Chemistry / Solutions

Dilution by Evaporation Calculator

Compute the final concentration of a non-volatile solute after a known fraction of solvent has evaporated, using mass co...

basic

9,873 4.9 1 min

Chemistry

Avogadro's Law Volume-Mole Calculator

Apply Avogadro's law to a gas held at constant temperature and pressure: V₁ / n₁ = V₂ / n₂. Compute V₂ (or any other unk...

basic

9,812 5.0 1 min

Chemistry

Moles of Gas Collected Over Water from Total Pressure and Volume Calculator

Compute the moles of dry gas collected by water displacement: subtract the water-vapour partial pressure at the experime...

basic

9,512 4.9 1 min

Chemistry

pH of a Strong Base from Molarity Calculator

Compute the pH of a strong base solution from its analytical concentration. With complete dissociation [OH⁻] = C, pOH =...

basic

7,753 5.0 1 min

Chemistry

First-Order Reaction Half-Life Calculator

Calculates the half-life of a first-order chemical reaction from the rate constant, and the concentration remaining afte...

basic

5,436 4.1 1 min

Chemistry

Density of an Ideal Mixture from Mass Fractions and Component Densities Calculator

Compute the bulk density of an ideal liquid mixture from up to three components, each given as a mass fraction (decimal,...

basic

4,161 3.8 1 min

Chemistry / Solutions

Mole Fraction from Mass Percent Calculator

Compute the mole fraction of solute A in a binary mixture from its mass percentage and the molar masses of solute and so...

basic

3,523 4.9 1 min

Chemistry

Enthalpy of Formation from Combustion Data Calculator

Compute a fuel's standard enthalpy of formation from its measured heat of combustion and the tabulated standard enthalpi...

basic

3,512 4.9 1 min

Chemistry

Percent Purity from Back-Titration Calculator

Compute the percent purity of a sample using a back-titration: excess reagent B remaining after reacting with impure sam...

basic

3,214 4.2 1 min

Chemistry

Water of Crystallization n from % Water Calculator

Reverse-engineer the n in M·nH₂O from the percent water of hydration and the molar mass of the anhydrous compound: n = (...

basic

459 4.1 1 min

Chemistry

Atom Economy of a Chemical Reaction Calculator

Calculates atom economy = (MW of desired product / sum of MWs of all products) × 100%. A higher atom economy means less...

basic

24,822 4.4 1 min

Chemistry

Ksp Solubility Product Ion Concentration Calculator

Calculates the molar solubility and ion concentrations of a sparingly soluble salt from its Ksp and stoichiometry (e.g.,...

basic

24,277 4.6 1 min

Chemistry

Secular Equilibrium Daughter Activity Buildup Calculator

Calculates the activity of a daughter nuclide at time t in secular equilibrium (parent half-life >> daughter half-life)....

basic

22,504 4.0 1 min

Chemistry

Van der Waals Real Gas Calculator

Computes the pressure of a real gas using the Van der Waals equation given temperature, volume, and moles with molecule-...

basic

19,815 4.8 1 min

Chemistry

Density from Molar Mass and Molar Volume Calculator

Compute the mass density of a substance from its molar mass M and molar volume Vm: ρ = M / Vm. For an ideal gas at STP,...

basic

18,526 4.8 1 min

Chemistry

Langmuir Adsorption Isotherm Fractional Coverage Calculator

Compute the fractional surface coverage θ of an adsorbate on a uniform surface as a function of partial pressure P and t...

basic

17,915 5.0 1 min

Chemistry

Lattice Energy via Born-Haber Cycle Calculator

Estimate the lattice energy of an MX-type ionic solid by closing the Born-Haber cycle: U = ΔH_f − ΔH_sub − ½·BE(X-X) − I...

basic

16,849 4.8 1 min

Chemistry

van 't Hoff Equilibrium Constant Calculator

Use the van 't Hoff equation to predict the equilibrium constant K₂ at a new temperature T₂ given K₁ at T₁ and the stand...

basic

14,240 4.4 1 min

Chemistry / Solutions

Mole Fraction to Mass Percent (Binary Mixture) Calculator

Convert the mole fraction of component A in a binary mixture to mass-percent (and vice-versa for component B), given the...

basic

12,795 4.2 1 min

Showing 121 to 144 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

Half-Cell EMF from Standard Reduction Potentials (Nernst) Calculator

Water Hardness from Ca²⁺ and Mg²⁺ Calculator

Weak-Acid ICE Table Calculator

Radiocarbon Decay Age Estimation Calculator

Weak Acid pH from Ka Calculator

Dilution by Evaporation Calculator

Avogadro's Law Volume-Mole Calculator

Moles of Gas Collected Over Water from Total Pressure and Volume Calculator

pH of a Strong Base from Molarity Calculator

First-Order Reaction Half-Life Calculator

Density of an Ideal Mixture from Mass Fractions and Component Densities Calculator

Mole Fraction from Mass Percent Calculator

Enthalpy of Formation from Combustion Data Calculator

Percent Purity from Back-Titration Calculator

Water of Crystallization n from % Water Calculator

Atom Economy of a Chemical Reaction Calculator

Ksp Solubility Product Ion Concentration Calculator

Secular Equilibrium Daughter Activity Buildup Calculator

Van der Waals Real Gas Calculator

Density from Molar Mass and Molar Volume Calculator

Langmuir Adsorption Isotherm Fractional Coverage Calculator

Lattice Energy via Born-Haber Cycle Calculator

van 't Hoff Equilibrium Constant Calculator

Mole Fraction to Mass Percent (Binary Mixture) Calculator