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

Joule-Thomson Temperature Drop Calculator

Compute the temperature change of a real gas during an isenthalpic (Joule-Thomson) throttling expansion: ΔT = μ_JT × ΔP,...

basic

7,236 4.2 1 min

Chemistry

Mole-to-Mole Stoichiometry Calculator

Compute the moles of product B produced (or reactant B consumed) per moles of A using the balanced-equation coefficients...

basic

6,295 4.8 1 min

Chemistry

Ion Product Q vs Ksp Precipitation Prediction Calculator

Calculates the reaction quotient Q = [Mⁿ⁺]^a · [Xᵐ⁻]^b and compares it to Ksp. If Q > Ksp, precipitation occurs; Q < Ksp...

basic

5,576 4.3 1 min

Chemistry

Debye–Hückel Activity Coefficient from Ionic Strength Calculator

Calculates the mean activity coefficient using the Debye–Hückel limiting law: log γ± = −A · |z+·z−| · √I, where A ≈ 0.50...

basic

4,713 4.1 1 min

Chemistry

Average Atomic Mass from Isotopic Abundances Calculator

Compute the weighted-average atomic mass of an element from the isotopic masses (atomic mass units) and natural-abundanc...

basic

4,445 4.2 1 min

Chemistry

Radioactive Decay Activity from Half-Life and Number of Atoms Calculator

Compute the activity A of a radioactive sample: A = λN = (ln 2 / t½) · N, where t½ is the half-life in seconds and N is...

basic

2,170 4.2 1 min

Chemistry

Vapor Density from Molar Mass Calculator

Compute the vapor density of a gas relative to hydrogen (VD = M / 2) from its molar mass, and the corresponding mass den...

basic

1,950 4.0 1 min

Chemistry

Degree of Ionization from Ka and Concentration Calculator

Compute the fractional degree of ionization α of a weak monoprotic acid (HA ⇌ H⁺ + A⁻) using the dilute-solution approxi...

basic

1,823 4.8 1 min

Chemistry

Partition Coefficient (log P) from Concentration Ratio Calculator

Determines the partition coefficient P (and its logarithm log P) of a solute distributed between two immiscible solvents...

basic

1,003 4.7 1 min

Chemistry

RMS Speed of a Gas Molecule from Temperature Calculator

Compute the root-mean-square speed of a gas molecule at temperature T from kinetic theory: v_rms = √(3·R·T / M), where R...

basic

24,850 4.5 1 min

Chemistry

Oxygen Stoichiometry for Complete Combustion Calculator

Given the number of carbon (x), hydrogen (y), and oxygen (z) atoms in one molecule of a hydrocarbon or oxygenate fuel, c...

basic

24,744 4.9 1 min

Chemistry

Iodine Value of Unsaturated Fat Calculator

Calculates the iodine value — grams of iodine (I₂) absorbed per 100 g of fat. Used to measure the degree of unsaturation...

basic

24,402 4.7 1 min

Chemistry

Conjugate Base pH from pKa and Concentration Calculator

Calculates the pH of a conjugate base (A⁻) solution: pH = ½(pKw + pKa + log[C]), where pKw = 14. Accounts for hydrolysis...

basic

22,808 5.0 1 min

Chemistry

Ostwald Dilution Law Calculator

Compute the degree of dissociation α of a weak electrolyte from Ostwald's dilution law α = √(Ka / c). Also reports the d...

basic

20,820 4.0 1 min

Chemistry

Multistage Solvent-Extraction Residue Calculator

Compute the fraction of solute remaining in the aqueous phase after n batchwise extractions with a fresh portion of orga...

basic

20,032 4.9 1 min

Chemistry

Electroplating Mass Deposited (Faraday's Law) Calculator

Compute the mass of metal deposited at the cathode during electroplating from the current, time, molar mass of the metal...

basic

17,663 3.9 1 min

Chemistry

Carbon-14 Dating Calculator

Estimate the age of an organic sample from the remaining fraction of carbon-14, using the Libby half-life of 5730 years...

basic

17,287 4.9 1 min

Chemistry / Solutions

Raoult's Law Vapor Pressure Mixture Calculator

Calculates the total vapor pressure of an ideal binary liquid mixture using Raoult's Law from mole fractions and pure co...

basic

16,685 4.5 1 min

Chemistry

pH after Mixing Two Strong-Acid Solutions Calculator

Compute the resultant pH after mixing two strong-acid solutions of arbitrary molarity and volume. Strong acids fully dis...

basic

16,660 4.6 1 min

Chemistry

Maxwell-Boltzmann Most-Probable Speed of a Gas Molecule Calculator

Compute the most-probable speed of gas molecules from the Maxwell-Boltzmann speed distribution: v_p = √(2RT/M), where R...

basic

14,932 4.9 1 min

Chemistry

Electrochemical Equilibrium Constant from Standard EMF Calculator

Calculates the equilibrium constant K = exp(nFE°/RT) from the standard cell EMF E° and number of electrons transferred n...

basic

14,035 4.4 1 min

Chemistry

van der Waals Real Gas Pressure Calculator

Compute the pressure of a real gas using the van der Waals equation P = nRT/(V − nb) − a·n²/V², with the gas-specific co...

basic

9,562 4.7 1 min

Chemistry / Solutions

Solubility in Common-Ion Solution from Ksp Calculator

For a salt AB dissolving in a solution already containing [B] = c₀, calculates the new molar solubility s where Ksp = s(...

basic

9,461 5.0 1 min

Chemistry / Solutions

Mass Percent to Mole Fraction Calculator

Convert a binary solution's solute mass percent into the solute mole fraction, given the molar masses of the solute and...

basic

8,796 3.8 1 min

Showing 73 to 96 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

Joule-Thomson Temperature Drop Calculator

Mole-to-Mole Stoichiometry Calculator

Ion Product Q vs Ksp Precipitation Prediction Calculator

Debye–Hückel Activity Coefficient from Ionic Strength Calculator

Average Atomic Mass from Isotopic Abundances Calculator

Radioactive Decay Activity from Half-Life and Number of Atoms Calculator

Vapor Density from Molar Mass Calculator

Degree of Ionization from Ka and Concentration Calculator

Partition Coefficient (log P) from Concentration Ratio Calculator

RMS Speed of a Gas Molecule from Temperature Calculator

Oxygen Stoichiometry for Complete Combustion Calculator

Iodine Value of Unsaturated Fat Calculator

Conjugate Base pH from pKa and Concentration Calculator

Ostwald Dilution Law Calculator

Multistage Solvent-Extraction Residue Calculator

Electroplating Mass Deposited (Faraday's Law) Calculator

Carbon-14 Dating Calculator

Raoult's Law Vapor Pressure Mixture Calculator

pH after Mixing Two Strong-Acid Solutions Calculator

Maxwell-Boltzmann Most-Probable Speed of a Gas Molecule Calculator

Electrochemical Equilibrium Constant from Standard EMF Calculator

van der Waals Real Gas Pressure Calculator

Solubility in Common-Ion Solution from Ksp Calculator

Mass Percent to Mole Fraction Calculator