Solutions & Concentrations

  • Molar Solubility from Ksp Calculator
    Calculate the molar solubility (s) of a sparingly soluble salt from its Ksp and stoichiometry. Free chemistry tool with worked example and formula.
  • mEq to mg Calculator
    Convert milliequivalents (mEq) to milligrams (mg) for electrolytes like sodium, potassium, calcium and magnesium using atomic weight and valence.
  • Milliliters to Grams Calculator
    Convert milliliters (mL) to grams using density. Enter volume and density to instantly get mass in grams and kilograms with the formula m = V × ρ.
  • 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.
  • Acid Dilution Preparation Calculator
    Calculate how much concentrated stock acid and water you need to prepare a dilute acid solution at a target molarity and volume using M1V1 = M2V2.
  • 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.
  • Molarity to Normality Calculator
    Convert molarity (M) to normality (N) instantly using N = M × n. Enter molarity and equivalents per mole to get solution normality for titrations.
  • Moles to Number of Particles Calculator
    Convert moles to the number of particles (atoms, molecules, ions) using Avogadro's number. Free, instant N = n × 6.022×10²³ calculator.
  • Water to Add for Dilution Calculator
    Find how much water to add to dilute a solution from one concentration to a lower target. Uses V_water = V1·(C1−C2)/C2. Free and instant.
  • Dilution Volume Calculator
    Calculate the stock volume needed for a dilution using C1V1 = C2V2. Enter stock and final concentrations plus final volume to get V1 and solvent.
  • Mass to Molarity Calculator
    Convert mass to molarity instantly. Enter solute mass (g), molecular weight (g/mol) and solution volume to get molar concentration (mol/L).
  • mg/mL to Molarity Calculator
    Convert a mg/mL concentration to molarity (mol/L). Enter concentration and molar mass to get M, mM and µM instantly.
  • Molarity to g/L Calculator
    Convert molarity (mol/L) to mass concentration in grams per liter (g/L) using the molar mass. Fast, accurate chemistry conversion tool.
  • PPM to mg/L Calculator
    Convert ppm to mg/L instantly. Enter parts per million and solution density to get milligrams per liter. For water (density ≈1), ppm = mg/L.
  • Volume Percent Calculator (%v/v)
    Calculate volume percent concentration (%v/v) from the volume of solute and total volume of solution. Fast, free, and accurate for chemistry and labs.
  • Mass Percent Composition Calculator
    Calculate the mass percent composition of an element in a compound. Enter the element mass and total compound mass to get the percentage by mass instantly.
  • Grams to Milliliters Calculator
    Convert grams to milliliters using density. Enter mass in grams and density in g/mL to get the volume instantly with the formula V = m / ρ.
  • Moles to Grams Calculator
    Convert moles to grams instantly. Enter the amount in moles and the molar mass (g/mol) to find mass using mass = moles × molar mass.
  • Mass Needed for Molarity Calculator
    Calculate the mass of solute in grams needed to prepare a solution of a given molarity and volume. Enter molarity, volume, and molar mass.
  • PPM to Percent Calculator
    Convert parts per million (ppm) to percent instantly. Enter any ppm value and get the equivalent % using percent = ppm ÷ 10,000.
  • Molarity to PPM Calculator
    Convert molarity (mol/L) to parts per million (ppm) instantly. Enter molarity and molar mass to get ppm for dilute aqueous solutions.
  • Ka and pKa Calculator
    Convert between Ka and pKa instantly. Enter an acid dissociation constant to get pKa, or a pKa to get Ka using pKa = -log10(Ka).
  • Percent to PPM Calculator
    Convert a percent concentration to parts per million (ppm) instantly. Enter a percentage and get the ppm value using ppm = percent × 10,000.

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