# Solving Concentration Problems

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Molarity is an expression of the moles of solute (Na OH) per liter of solution (water).

To work this problem, you need to be able to calculate the number of moles of sodium hydroxide (Na OH) and be able to convert cubic centimeters of a solution into liters.

In a lab setting, you may be asked to find the molarity, or molar concentration, of the solution instead.

Tip: You don’t need to include the volume of the solute since it doesn’t usually affect the volume that much.

For example, if we add a small amount of ethanol to water, then the ethanol is the solute, and the water is the solvent.

If we add a smaller amount of water to a larger amount of ethanol, then the water could be the solute!

If there is a visible change in volume when you mix the solute with the solvent, then use the total volume instead. (Add the atomic masses of the constituent elements.) Then, convert milligrams to grams by dividing by 1000.

Finally, divide the grams of your substance by the Molar Mass.

You dilute a solution whenever you add solvent to a solution.

Adding solvent results in a solution of lower concentration.

## Comments Solving Concentration Problems

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Practice calculations for molar concentration and mass of solute.…