# Molarity and Concentration

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Concentration measures the number of moles of solute per liter of solution, besides that it can be used to measures also the ratio of mass per liter.
Molarity also measures the number of mole of a solute per liter of solution.
Then what is the difference between these two definitions? They seem to be alike.

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Concentration measures the number of moles of solute per liter of solution

No, concentration is a measure of amount of something in something. It doesn't have to be expressed in moles per liter, there are many ways to express the concentration (most common ones being molarity, molality, mass/volume fraction - often expressed in terms of percentage or parts per something - and molar fraction).

Molarity is much more narrow term than the concentration.

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Then what is the difference between these two definitions? They seem to be alike.
"They" lack a specification of temperature.

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No, concentration is a measure of amount of something in something. It doesn't have to be expressed in moles per liter, there are many ways to express the concentration (most common ones being molarity, molality, mass/volume fraction - often expressed in terms of percentage or parts per something - and molar fraction).

Molarity is much more narrow term than the concentration.
Then molarity, molality ... Are only special cases of concentration?

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Then molarity, molality ... Are only special cases of concentration?

You can put it that way.

Mentor
Then molarity, molality ... Are only special cases of concentration?
They are not "special cases," they are measures of concentration.