23 free chemistry calculators from the Chemistry Calculator Suite. Each one opens directly, with no login.
Relate a rate constant to temperature with k = AĀ·e^(āEa/RT): give any three of A, Ea (kJ/mol), T and k and solve for the fourth.
Solve the BeerāLambert law A = Īµlc for absorbance, molar absorptivity, path length or concentration ā leave the one you want blank.
Find the pH of a buffer from its pKa and the concentrations of the conjugate base [Aā»] and the weak acid [HA], using the HendersonāHasselbalch equation.
Balance a chemical equation: type the species with + between them and = or -> between the two sides, and get the balanced equation with its coefficients.
Relate vapour pressure to temperature with the ClausiusāClapeyron equation: from Pā at Tā and a second temperature Tā, solve for Pā or for the enthalpy of vaporisation.
Use PāVā/Tā = PāVā/Tā for a fixed amount of gas: fill five of the six values, with temperatures in kelvin, and solve for the one you leave blank.
Work out the molarity of a solution from the mass of solute, its molar mass and the volume of solution. Type a formula such as NaOH instead of a molar mass and the calculator finds it for you.
Solve MāVā = MāVā for whichever of the four values you leave blank ā the standard way to plan a dilution from a stock solution.
Enter an element symbol or atomic number to get its ground-state electron configuration, with the elementās common oxidation states.
Get the equivalent weight of a substance as its molar mass divided by its n-factor. Enter a formula or the molar mass directly.
Enter ĪH in kJ/mol, the temperature in kelvin and ĪS in J/molĀ·K to get ĪG = ĪH ā TĪS, and with it whether the process is spontaneous at that temperature.
Compare the effusion rates of two gases with Grahamās law, rā/rā = ā(Mā/Mā). Enter each gas as a formula or as its molar mass.
Solve PV = nRT for pressure, volume, amount or temperature: leave the unknown blank. Pressure is in atm, volume in litres and R = 0.08206 LĀ·atm/molĀ·K.
Convert between the solubility product Ksp and the molar solubility s of a salt AāBįµ§: enter x, y and either of the two values.
Convert between the mass and the amount of any substance: type its formula and either the mass in grams or the moles, and the other is calculated from the molar mass.
Type any chemical formula ā brackets and hydrates such as Ca(OH)2 or CuSO4.5H2O included ā to get its molar mass and percentage composition by element.
Correct a standard electrode potential for real conditions: enter EĀ°, the number of electrons n and the reaction quotient Q to get E = EĀ° ā (0.0592/n)Ā·log Q at 298 K.
Type a formula, the element you are interested in and the overall charge, and get that elementās oxidation state by the standard rules (peroxides and hydrides are the known exceptions).
Enter a principal quantum number n (1 to 8) to see its subshells, the number of orbitals in each, the total of nĀ² orbitals and the 2nĀ² electrons the shell can hold.
Radioactive decay with N = Nā(Ā½)^(t/tĀ½): leave any one of Nā, N, t or the half-life blank and it is calculated from the other three.
A copy-ready table of the constants chemistry numericals use: Avogadro, both values of R, Planck, the speed of light, the elementary charge, Boltzmann, Faraday, electron and proton mass, standard pressure, molar volume, Rydberg and Īµā. Tap a value to copy it.
Use the van āt Hoff equation to see how an equilibrium constant changes with temperature: from Kā at Tā and a second temperature Tā, solve for Kā or for ĪHĀ°.
Enter any one of [Hāŗ], pH, [OHā»] or pOH and get the other three, using pH + pOH = 14 at 25 Ā°C.