Chemistry

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Chemistry

Transparent chemistry and solution calculations.

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Activation Energy Calculator

Calculate activation energy from two rate measurements and absolute temperatures.

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Actual Yield Calculator

Calculate percent yield from actual and theoretical product amounts.

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Air-Fuel Ratio Calculator

Calculate air-to-fuel mass ratio and lambda from explicit masses.

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Alligation Calculator

Blend low- and high-concentration sources to reach a target concentration.

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Arrhenius Equation Calculator

Predict a rate constant at a new absolute temperature.

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Atom Economy Calculator

Calculate atom economy from product and total reactant molar masses.

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Atomic Mass Number Calculator

Calculate mass number from proton and neutron counts.

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Average Atomic Mass Calculator

Calculate weighted average atomic mass for two isotopes.

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Avogadro Number Calculator

Convert moles to particles using the exact Avogadro constant.

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Beer-Lambert Law Calculator

Calculate absorbance from molar absorptivity, path length, and concentration.

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Bleach Dilution Calculator

Calculate stock bleach and water volumes using C1V1 = C2V2.

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Boiling-Point Elevation Calculator

Calculate colligative boiling-point elevation from molality, Kb, and van't Hoff factor.

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Bond Order Calculator

Calculate molecular-orbital bond order from bonding and antibonding electrons.

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Hydrogen Ion Concentration Calculator

Convert pH to hydrogen- and hydroxide-ion concentrations.

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Ionic Strength Calculator

Calculate ideal single-ion ionic strength from concentration and charge.

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Isoelectric Point Calculator

Estimate pI as the mean of two explicit bracketing pKa values.

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Langmuir Isotherm Calculator

Calculate equilibrium loading with the Langmuir adsorption equation.

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Mass Concentration to Molar Concentration Calculator

Convert mass concentration to molarity with an explicit molar mass.

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Mass Percent Calculator

Calculate solute mass percentage from solute and total masses.

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Michaelis-Menten Equation Calculator

Calculate enzyme initial rate from Vmax, Km, and substrate concentration.

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Miller Indices Calculator

Calculate reciprocal Miller-index components from normalized intercepts.

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Molality Calculator

Calculate molality from solute moles and solvent mass.

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Molar Mass of Gas Calculator

Calculate gas molar mass from ideal-gas measurements and sample mass.

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Molar Ratio Calculator

Calculate a two-component molar ratio and normalized fractions.

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Mole Calculator

Calculate moles from sample mass and molar mass.

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Mole Fraction Calculator

Calculate component mole fractions for a two-component mixture.

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Moles to Atoms Calculator

Convert moles to particle count using Avogadro's constant.

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Nernst Equation Calculator

Calculate cell potential from standard potential, reaction quotient, electron count, and temperature.

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Neutralization Calculator

Calculate acid moles and monoprotic base volume at equivalence.

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Normality Calculator

Calculate normality from molarity and an equivalents-per-mole factor.

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Osmotic Pressure Calculator

Calculate ideal dilute-solution osmotic pressure with the van't Hoff equation.

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Partial Pressure Calculator

Calculate component partial pressure using Dalton's law.

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Percent Composition Calculator

Calculate component mass percentage from component and total mass.

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Percent Ionic Character Calculator

Estimate ionic character with the Pauling electronegativity-difference relation.

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Percent Yield Calculator

Calculate reaction percent yield from actual and theoretical yields.

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Buffer pH Calculator

Calculate buffer pH from pKa and conjugate base and acid amounts.

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Carbon Dating Calculator

Estimate radiocarbon age from remaining fraction and an explicit isotope half-life.

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Concentration Calculator

Calculate mass concentration from solute mass and solution volume.

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Degree of Unsaturation Calculator

Calculate DBE (double-bond equivalents) from a molecular formula atom count.

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Detention Time Calculator

Calculate hydraulic detention (residence) time as volume divided by flow.

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Diffusion Coefficient Calculator

Calculate a spherical particle's diffusion coefficient using Stokes-Einstein in SI units.

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Dilution Factor Calculator

Calculate dilution factor from aliquot and final solution volumes.

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Electrolysis Calculator

Calculate deposited mass and moles using Faraday's law.

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Electromotive Force Calculator

Calculate standard cell EMF from cathode and anode reduction potentials.

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Freezing Point Depression Calculator

Calculate freezing-point depression with the van't Hoff factor, cryoscopic constant, and molality.

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Gibbs Energy Calculator

Calculate Gibbs free-energy change from enthalpy, temperature, and entropy.

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Graham's Law Calculator

Calculate relative effusion rate from two molar masses.

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Grams to Moles Calculator

Convert a sample mass to amount of substance using molar mass.

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Half-Life Calculator

Calculate half-life and elapsed age from a decay constant and remaining fraction.

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pKa Calculator

Calculate pKa from an acid dissociation constant Ka.

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PPM to Molarity Calculator

Convert dilute aqueous ppm (mg/L) to molarity using molecular mass.

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Q10 Calculator

Calculate a temperature coefficient from two rates and temperatures.

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Radioactive Decay Calculator

Calculate remaining and decayed amount from half-life and elapsed time.

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Rate Constant Calculator

Calculate a first-order rate constant from initial and remaining amounts.

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Reconstitution Calculator

Calculate final volume from solute mass and target concentration.

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Resuspension Calculator

Calculate resuspension volume from pellet mass and target concentration.

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Saponification Value Calculator

Calculate saponification value from potassium hydroxide consumed and sample mass.

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Serial Dilution Calculator

Calculate overall dilution factor from explicit sequential factors.

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Solution Dilution Calculator

Calculate final and solvent volumes with C1V1 = C2V2.

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Theoretical Yield Calculator

Calculate product mass from one limiting reactant and explicit stoichiometric coefficients.

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Titration Calculator

Calculate monoprotic equivalence volume with C1V1 = C2V2.

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Water Hardness Calculator

Calculate calcium-carbonate-equivalent hardness from calcium and magnesium concentrations.

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Young–Laplace Equation Calculator

Calculate spherical-interface pressure difference from surface tension and radius.

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Dilution Calculator

Calculate stock volume and solvent volume with C1V1 = C2V2.

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Molarity Calculator

Calculate molarity, moles, or mass using an explicit litre and molar-mass basis.

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pH Calculator

Calculate pH and pOH for an ideal strong monoprotic acid or base at 25 °C.

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Activity Coefficient Calculator

Calculate an ideal-dilute Debye–Hückel activity coefficient from explicit ionic strength, charge, and A.

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Buffer Capacity Calculator

Calculate monoprotic buffer capacity from total concentration, pKa, and pH.

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Cubic Unit Cell Calculator

Calculate crystal density from molar mass, cubic edge length, and formula units per cell.

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Percent Solution Calculator

Calculate percent concentration with an explicit mass/mass, mass/volume, or volume/volume basis.

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Percentage Concentration to Molarity Calculator

Convert an explicitly selected percentage basis to molarity using molar mass and required density.

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Raoult's Law Calculator

Calculate ideal binary-solution partial and total vapor pressure.

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Standard Temperature and Pressure Calculator

Compare declared IUPAC 100 kPa and legacy 1 atm STP conventions.

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Vapor Pressure of Water Calculator

Calculate water or ice saturation pressure with declared temperature limits.

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Total Dissolved Solids Calculator

Calculate TDS from conductivity and a user-supplied calibration factor.

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Vapor Pressure Calculator

Calculate vapor pressure with explicit Antoine coefficients and unit scale.

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Reaction Quotient Calculator

Calculate a reaction quotient from explicit activities and stoichiometric coefficients.

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Entropy Change Calculator

Calculate ΔS = qrev/T from reversible heat and absolute temperature.

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Calibration Curve Calculator

Fit a three-point linear calibration curve and estimate an unknown.

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Boiling Point Calculator

Calculate boiling point using an explicit model and coefficients.

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Effective Nuclear Charge Calculator

Calculate effective nuclear charge from explicit atomic number and shielding.

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Equilibrium Constant Calculator

Calculate an equilibrium constant from explicit concentrations and stoichiometry.

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Heat of Combustion Calculator

Calculate heat released from explicit mass and specific energy.

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Mixing Ratio Calculator

Calculate a mixture ratio from explicit component quantities.

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Gibbs Phase Rule Calculator

Calculate degrees of freedom from components and phases.

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Kp Equilibrium Constant Calculator

Calculate Kp from explicit partial pressures and stoichiometry.

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Crude Protein Calculator

Calculate crude protein from nitrogen and an explicit conversion factor.

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Empirical Formula Calculator

Calculate normalized C/H/N/O/X mole ratios from entered elemental masses and atomic masses.

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Electronegativity Difference Calculator

Calculate the signed and absolute difference between two entered electronegativity values on a named scale.

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Enzyme Activity Calculator

Calculate direct assay activity from measured micromoles, time, and sample volume.

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Lattice Energy Calculator

Calculate Born–Landé lattice energy from explicitly entered charges, separation, and crystal-model constants.

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Chemical Oxygen Demand Calculator

Calculate COD from blank and sample titrant volumes with an explicitly entered equivalent conversion factor.

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Liquid Ethylene Density Calculator

Estimate liquid density with the Rackett equation using entered critical properties and fluid coefficients.

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Boiling Point at Altitude Calculator

Calculate altitude-adjusted pressure and boiling temperature from explicit atmospheric and Antoine-equation parameters.

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Atomic Mass to Moles Converter

Converts a given mass of a substance to moles using its atomic or molar mass.

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Molarity to Dilution Calculator

Calculates the volume of stock solution needed to prepare a diluted solution of desired molarity and volume.

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Percent Yield Calculator

Calculates the percent yield of a chemical reaction from actual and theoretical yields.

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Freezing Point Depression Calculator

Calculates the freezing point depression of a solution based on the solvent's cryoscopic constant, the van't Hoff factor, and molality.

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Boiling Point Elevation Calculator

Calculates the boiling point elevation of a solution based on the molality of the solute and the solvent's ebullioscopic constant.

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