• Concentration of a solution

• useful for calculating moles of a solute in a solution​

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Molarity = moles per liter

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Molarity (M) = moles/Liter

How many moles of copper(II) sulfate are in 250 mL of a 0.50M solution?

M = 0.50 M L = 250 mL = 0.250 L​

moles = Molarity x L of solution

moles = 0.50 x 0.250​

moles = 0.025 moles CuSO₄​

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Molarity (M) = moles/Liters

What is the molarity of a 1.0 L solution containing 75.0 g of ​sodium chloride?

​Convert grams of sodium chloride to moles. Then plug moles value into molarity equation.

75.0 g NaCl = ​1.28 moles NaCl

Molarity = 1.28 moles/ 1.0 L

Molarity = 1.3 M NaCl​

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Molarity (M) = moles/Liters

What is the volume of a 0.50 M solution containing 0.75 moles of solute?

Rearrange the equation so volume is no longer in the denominator, then solve.

Molarity x Liters = moles. Liters = moles/ Molarity​

Liters = 0.75 moles/ 0.50 M

Liters = 1.5 L ​

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More Practice Problems

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