![]() ![]() m₁ is the concentration of stock solution. ![]() m₂ is the concentration of diluted solution.V₁ is the volume of stock solution and.We can fill in the numbers for all the variables except for the volume of stock solution:īy rearranging the equation, we will find the volume of stock solution required: Therefore, we need to dilute 0.005 L (or 5 mL) of stock solution to a final volume of 1 L to get a 200 ppm NaOH solution.Ppm means parts-per-million. But what parts? The amount of particles in a suspension can be expressed as the total volume OR total mass of particles in a unit volume of water AND THESE TWO NUMBERS WILL ONLY BE THE SAME IF THE DENSITY OF THE PARTICLES IS 1 g/cm3. If ppm is expressed as THE VOLUME of particles to a unit volume of water, then ppm BY VOLUME is equal to µl/l. However, if ppm is expressed as THE MASS of particles in a unit volume of water, then ppm BY MASS is equal to mg/l. To convert from ppm by volume to ppm by mass, multiply by the density of the particles. For example, a sample with a volume concentration of 25 µl/l will have a mass concentration of 25*2.65 = 66 mg/l.įor mineral grains (clay, silt and sand sizes), this will typically be 2.65 g/cm3. To convert from ppm by mass to ppm by volume, divide by the density of the particles. For example, a sample with a mass concentration of 100 mg/l will have a volume concentration of 38 µl/l. ![]()
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