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Molarity is often used to express concentrations of plant hormones especially in tissue culture.

It is a good way to compare hormones because it is an expression of active molecules in the solution regardless of the weight of the compound.

A one molar solution (1 M) is the molecular weight of the compound in grams dissolved in a solvent to measure one liter.

Researchers commonly use molarity to express hormone concentrations.

Growers need to be able to convert molar to ppm as well as ppm to molar.

Conversion of ppm to molar uses the following formula:

ppm = micromolar concentration x molecular weight divided by 1000.

Conversion of ppm to molar is calculated as: ppm = # μM x molecular weight divided by 1000

Convert 2000 μM IBA to ppm. The molecular weight of IBA is 203. ppm= 2000 μM x 203 divided by 1000 = 406 ppm

Conversion of molar to ppm uses the following formula:

Micromolar = (ppm x 1000) divided by molecular weight.

Conversion of molar to ppm is calculated as: μM = # ppm x 1000 divided by Molecular weight

Convert 406 ppm IBA to molar. The molecular weight of IBA is 203. μM = 406 ppm x 1000 divided by 203 = 2000 μM