Solutions & Concentrations

  • Molality Calculator
    Calculate molality (mol/kg) from moles of solute and mass of solvent. Free, instant chemistry solution concentration calculator with worked examples.
  • Hydrogen Ion Concentration Calculator
    Convert between pH and hydrogen ion concentration [H+] instantly. Enter a pH to get [H+] = 10^(−pH), or enter [H+] to find pH, pOH, and [OH−].
  • Resuspension Volume Calculator
    Calculate the solvent volume needed to resuspend a substance to a desired concentration. Enter mass and target concentration to get volume in mL and µL.
  • Osmotic Pressure Calculator
    Calculate osmotic pressure (Π = iMRT) from van't Hoff factor, molarity and temperature. Get results in atm, kPa and mmHg instantly.
  • Ionic Strength Calculator
    Calculate the ionic strength of a solution from ion concentrations and charges using I = ½ Σ cᵢzᵢ². Supports up to four ion species.
  • Boiling Point Elevation Calculator
    Calculate boiling point elevation (ΔTb) from molality, the ebullioscopic constant Kb, and the van't Hoff factor i. Free chemistry colligative-property tool.
  • Water Soluble Fertilizer Calculator
    Calculate how many grams of water-soluble fertilizer to dissolve to reach a target nitrogen ppm for a given water volume and fertilizer %N.
  • Protein Concentration Calculator
    Calculate protein concentration in mg/mL from A280 absorbance and the extinction coefficient using the Beer-Lambert law. Free, fast, and accurate.
  • DNA Concentration Calculator
    Calculate double-stranded DNA concentration in ng/µL from A260 absorbance and dilution factor using the standard 50 ng/µL conversion constant.
  • Molarity Calculator
    Calculate molarity easily with this molarity calculator. Input the number of moles and volume in liters to determine the concentration of a solution. Accurate results for chemistry calculations.
  • Percent Ionization Calculator
    Enter initial and equilibrium concentrations (mol/L) to compute percent ionization (%) and degree of dissociation for weak acids or bases.

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