Solutions & Concentrations

  • pH of Weak Acid Calculator
    Calculate the pH of a weak acid solution from its Ka and initial concentration using the approximation [H⁺] = √(Ka·C). Free chemistry tool.
  • Concentrated Acid Molarity Calculator
    Calculate the molarity (mol/L) of a concentrated acid or stock solution from its mass percent, density, and molar mass with this free chemistry tool.
  • Essential Oil Dilution Calculator
    Calculate how many drops of essential oil to add to your carrier oil for a safe dilution percentage. Fast, accurate drops-per-ml blending tool.
  • Moles from Volume and Molarity Calculator
    Calculate moles of solute from molarity and volume using n = M × V. Enter mol/L and liters to get the amount of substance in moles instantly.
  • pH of Strong Base Calculator
    Calculate the pH and pOH of a strong base solution from its molar concentration and number of hydroxide ions per formula unit at 25 °C.
  • Molarity to mg/mL Calculator
    Convert molarity (mol/L) to mg/mL using molecular weight. Free online molarity to mg/mL calculator for lab solution preparation and chemistry.
  • Final Volume After Dilution Calculator
    Calculate the final volume (V2) after diluting a solution using V2 = C1·V1 / C2. Find how much solvent to add to reach a target concentration.
  • Molarity to Mass Percent Calculator
    Convert molarity (mol/L) to mass percent (% w/w) using molar mass and solution density. Free, instant chemistry concentration converter.
  • Hydroxide Ion Concentration Calculator
    Convert pOH to hydroxide ion concentration [OH⁻] or back. Calculates [OH⁻], pOH, pH and [H⁺] instantly using [OH⁻] = 10^(−pOH).
  • Mass/Volume Percent (w/v) Calculator
    Calculate mass/volume percent (w/v%) of a solution from grams of solute and mL of solution. Instant w/v% concentration result with formula and examples.
  • Percent Error Calculator (Chemistry)
    Calculate percent error in chemistry from experimental and theoretical values. Free percent error calculator with formula, worked example, and FAQ.
  • Molarity of Concentrated Solution from Percent
    Calculate the molarity of a concentrated solution from its mass percent (% w/w), density, and molar mass using M = (10 × %w/w × density) / MW.
  • Reagent Molarity Calculator
    Calculate the molarity (mol/L) of a concentrated acid or reagent solution from its density, percent weight (%w/w) purity, and molar mass.
  • Molar Mass from Mass and Moles Calculator
    Calculate molar mass (g/mol) from a known mass and number of moles using M = mass ÷ moles. Fast, accurate chemistry tool with worked examples.
  • PPM to PPB Calculator
    Convert parts per million (ppm) to parts per billion (ppb) instantly. Just multiply by 1000. Free, accurate ppm to ppb conversion calculator.
  • Final Concentration After Mixing Two Solutions Calculator
    Calculate the final concentration when two solutions are mixed using C_final = (C1·V1 + C2·V2)/(V1+V2). Free, fast, and unit-agnostic.
  • Grams per Liter Calculator (g/L)
    Calculate concentration in grams per liter (g/L) by dividing mass in grams by volume in liters. Fast, accurate, and free online tool.
  • Reef Tank Salt Mix Calculator
    Calculate how much reef salt mix to add to your water to hit a target salinity (ppt). Enter water volume, target salinity, and your salt's dose rate.
  • ABV Calculator from Original & Final Gravity
    Calculate alcohol by volume (ABV%) for beer, wine, mead, or cider from your original gravity (OG) and final gravity (FG) readings.
  • pH to pOH Calculator
    Convert pH to pOH instantly with this free calculator. Uses pOH = 14 − pH at 25°C and shows H⁺ and OH⁻ ion concentrations.
  • Stock Volume Needed Calculator (V1 = C2V2 / C1)
    Find the stock volume (V1) needed to make a diluted solution. Solve V1 = (C2 × V2) / C1 from the dilution equation and get diluent to add.
  • Percent by Mass (%w/w) Calculator
    Calculate percent by mass (%w/w) of a solution from the mass of solute and the total mass of solution. Free, instant chemistry concentration tool.
  • ABV to Proof Calculator
    Convert alcohol by volume (ABV %) to US proof instantly. US proof equals ABV multiplied by 2. Free, fast ABV to proof conversion tool.
  • Stock Solution Preparation Calculator
    Calculate the exact mass of solute needed to prepare a stock solution from molarity, volume, and molar mass. Free, fast and accurate.

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