Free Chemistry Tools

Molar mass, equation balancing, dilutions, pH and other lab and homework calculations.

10 free tools in this category. No sign-up, no limits.

Molar mass and percentage composition of any chemical formula.

Balance chemical equations instantly with atom counts for each side. Handles brackets, hydrates and redox equations. Free and private.

Interactive periodic table of all 118 elements: search by name, symbol or number and see mass, group, period and electron configuration.

Convert between pH, pOH, hydrogen ion concentration [H+] and hydroxide ion concentration [OH-] for a dilute aqueous solution at 25 degrees C.

Work out a solution's molarity (mol/L) or molality (mol/kg) from the moles of solute and the volume of solution or mass of solvent.

Work out the concentration, starting volume or final volume for diluting a solution, using C1V1 = C2V2. Solve for whichever value you need.

Convert a concentration between parts per million (ppm), parts per billion (ppb) and percentage, or work it out from a solute and solution mass.

Work out the amount remaining after radioactive decay, the elapsed time, or the half-life itself, from any two of the three quantities.

Work out a compound's empirical formula from its percentage composition by element, and its molecular formula if you also know the molar mass.

Find the limiting reagent, theoretical yield and percent yield for a chemical reaction, from a balanced equation and each reactant's mass.