How to Convert Micromolar to PPM

Concentrated solutions react more strongly.
••• Images

Micromolar (mM) and parts per million (ppm) both measure a solution's concentration. Micromolarity describes the number of particles dissolved in the solution. A 1 mM solution has 6.022 ×10^20 particles dissolved in each liter of solution, which is one thousandth of the concentration of a 1 M solution. A 1 ppm solution has 1 part of solute dissolved in a million parts of solution by mass. This latter concentration is equivalent to a milligram per liter when the solute is dissolved in water.

    Identify the atomic weights of each of the elements in the solute's formula. For instance, if you are converting the concentration of sodium hydroxide (Mg(OH2)), magnesium's atomic weight is 24.3, oxygen's is 16 and hydrogen's is 1.

    Multiply each element's relative atomic weight by the number of its atoms in the solute's chemical formula. With this example, where each molecule of magnesium hydroxide has 1 magnesium atom, 2 oxygen atoms and 2 hydrogen atoms: (1 × 23.4) + (2 × 16) + (2 × 1) = 57.4. This is the solute's relative formula mass.

    Multiply the solution's concentration, measured in millimolarity, by the solute's RFM. For instance, if the solution has a concentration of 15 mM: 15 × 57.4 = 861. This is the solution's concentration in ppm.


    • For a list of atomic weights, see the first Resource link.

Related Articles

How to Calculate a Milliequivalent
How to Calculate Concentration From Density
How to Convert From Moles Per Liter to Percentage
What Is Molarity & How Is It Calculated?
How to Find the Percent of Concentration of Copper...
Density Vs. Concentration
How to Calculate Solubilities
How to Calculate Milligrams per Milliliter
Density to Molarity Conversion
How to Calculate a Milliequivalent
How to Convert PPM to MCG
How to Find Mass Percentage
Conversion of PPM to Micromoles
How to Calculate Solid Concentration
How to Compute the Freezing Point of a Mixture
How to Calculate Moles
How to Convert From Molarity to Molality
How to Find the Number of Representative Particles...
How to Calculate Mole Fractions Using Mass Percent
How to Calculate Millimoles to Milligrams