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Contents

Solutions and Concentration 

Chapter:
Units of Measure
Author(s):

Phil B. Fontanarosa

and Stacy Christiansen

Solutions and Concentration

A molar solution contains 1 mol (1 g molecular weight) of solute in 1 L of solution. The SI style for reporting molar solutions is mol/L; for solutions with millimolar concentrations, mmol/L is used; and for solutions with micromolar concentrations, μmol/L is used. The concentration is given as 4-mmol/L potassium chloride, not 4 mmol/L of potassium chloride.

The gel was incubated at 40°C after applying 10 mL of a solution of 4-mmol/L potassium chloride and 5 mL of a solution of 1-mol/L sodium chloride.

Molar concentrations of solutions and reagents also may be expressed by using M to designate molar and SI prefixes to denote concentration (eg, mM for millimolar; μM for micromolar). Note that the molar concentration unit is set closed up to the number.

The gel was incubated at 40°C after applying 10 mL of a solution of 4mM potassium chloride and 5 mL of a solution of 1M sodium chloride.

A normal solution contains a concentration of 1 gram-equivalent of solute per liter.

To show the concentration of a solution in relation to normality (N), the abbreviation N is used, with no space between the numerical value and the N.

normal

N

half normal

0.5N or N/2

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