Chemistry Calculators

Calculator for Chemistry Calculations

Physical Chemistry

Physical ChemistryBuffer pH CalculatorFind the pH of a buffer from its components or from the masses you weighed, and plan the recipe for a target pH with the Henderson-Hasselbalch equation, buffer capacity and effective range.

Physical ChemistryBuffer Capacity CalculatorWork out a buffer's capacity beta three ways: from pKa, total concentration and pH with the Van Slyke equation, from a measured pH change, or straight from the weak acid and conjugate base concentrations.

Physical ChemistryBrine CalculatorWork out the salt for any brine, on the water, the total weight or the food alone, or run it backwards from the salt you already used. Includes spoon measures by salt brand, brining times by thickness and the density, molarity, salinometer degree and freezing point of the solution.

Physical ChemistryBoiling Point Elevation CalculatorWork out how far a dissolved solute raises a solvent's boiling point from the van't Hoff factor, the ebullioscopic constant and the molality, or run the equation backwards to recover the molality, the factor, the constant or the molar mass of an unknown solute.

Physical ChemistryBoiling Point CalculatorFind the boiling point of water and other substances at any pressure with the Clausius-Clapeyron relation, solve for the pressure needed to hit a target temperature, derive the heat of vaporisation from two measured points, or work from an altitude.

Physical ChemistryBleach Dilution CalculatorWork out how much bleach and water to mix for a target concentration in percent or ppm, or for a bleach-to-water ratio, using C1V1 = C2V2.

Physical ChemistryBeer–Lambert Law CalculatorSolve the Beer–Lambert law A = εlc for absorbance, molar absorptivity, path length or concentration; convert between absorbance, transmittance and %T; and find ε from a calibration.

Physical ChemistryAvogadro's Number CalculatorConvert between moles, mass, molar mass, and the number of atoms, molecules, or ions using Avogadro's number.

Physical ChemistryAtom CalculatorFind the number of protons, neutrons, and electrons in an atom or ion, or work backward from the particle counts to the atomic number, mass number, and charge.

Physical ChemistryAtomic Mass CalculatorFind the average atomic mass of an element from its isotopes and their abundances, work out a missing percent abundance from a known average, or get the mass number of a single atom from its protons and neutrons.

Physical ChemistryArrhenius Equation CalculatorSolve the Arrhenius equation k = A*exp(-Ea/RT) for any variable, or find the activation energy from a rate constant measured at two temperatures. Per mole or per molecule, with an Arrhenius plot.

Physical ChemistryAnnealing Temperature CalculatorFind the PCR annealing temperature three ways: from primer and product melting temperatures, from two primer melting temperatures, or from a primer's length and GC content. Includes a gradient range and thermal-cycle chart.

Physical ChemistryAlligation CalculatorSolve alligation problems: find the ratio and quantities to mix two stocks to a target strength (alternate), or the resulting strength of a blend (medial).

Physical ChemistryAlcohol Dilution CalculatorWork out how much water to add to dilute a spirit to a target strength, or solve for any volume or strength from the alcohol dilution formula.

Physical ChemistryAcid-Base CalculatorConvert between pH, pOH, [H+] and [OH-], and find the pH of weak or strong acids and bases and of buffers with the Henderson-Hasselbalch equation.

Analytical Chemistry

Analytical ChemistryMolar Absorptivity CalculatorSolve the Beer-Lambert law A = epsilon c l for molar absorptivity, absorbance, concentration, or path length. Enter any three values and get the fourth, plus transmittance, percent transmittance, and a calibration plot, in any units.

Analytical ChemistryDilution CalculatorSolve the dilution equation C1V1 = C2V2: enter any three of stock concentration, stock volume, final concentration, and final volume, and get the fourth plus the solvent to add and the dilution factor, in molar and volume units.

Analytical ChemistryActual Yield CalculatorSolve for actual yield, percent yield, or theoretical yield. Enter any two and get the third, plus stoichiometry and multi-step tools.