Normal Concentration Definition in Chemistry

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Normal concentration is molar concentration divided by an equivalence factor. Glow Images, Inc / Getty Images

There are two meanings for "normal" in chemistry. (1) Normal or normal concentration refers to a concentration of solutes that is the same in two samples. (2) Normality is the gram equivalent weight of a solution in a solution, which is its molar concentration divided by an equivalence factor. It is used in situations where molarity or molality might be confusing or else difficult to determine. Normal concentration is also known as normality, N, isotonic.


(1) A 9% salt solution has a normal concentration with respect to most human body fluids.
(2) A 1 M sulfuric acid (H2SO4) is 2 N for acid-base reactions because each mole of sulfuric acid provides 2 moles of H+ ions. A 2 N solution is called a 2 normal solution.