Molarity

Molarity

By Crystal Castleman

• Concentration of a solution

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

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​Some text here about the topic of discussion.

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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Multiple Choice

How many moles of citric acid are in 100.0 mL of a 0.35 M solution?

• 35

• 0.35

• 0.035

• 286

Multiple Choice

How many moles of sodium chloride are in 25.0 mL of a 5.00 M solution?0

• 125 moles

• 5.00 moles

• 0.200 moles

• 0.125 moles

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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Multiple Choice

What is the molarity of a 0.500 L solution containing 125.0 g of magnesium sulfate (MgSO₄)?

• 1.04 M

• 2.08 M

• 2.25 M

• 4.50 M

Multiple Choice

What is the molarity of a 1.25 L solution containing 95 g of glucose (C₆H₁₂O₆)

• 0.53 M

• 0.42 M

• 76 M

• 1.06 M

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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Multiple Choice

What the is the volume of a 0.25 M solution containing 0.050 moles of solute?

• 0.20 L

• 0.0125 L

• 5.0 L

• 2.5 M

Multiple Choice

What is the volume of a 3.0 M solution containing 0.25 moles of solute?

• 12 L

• 83 mL

• 83 L

• 0.12 L

More Practice Problems

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Multiple Choice

What is the molarity of a 0.30 liter solution containing 0.50 moles of NaCl?

• 0.60 M

• 0.15 M

• 0.30 M

• 1.7 M

Multiple Choice

How many moles of NaCl are present in 600. ml of a 1.55 M NaCl solution?.

• 0.930 moles

• 930 moles

• 2.58 moles

• 387 moles

Multiple Choice

What is the molarity of 650 ml of solution containing 63 grams of NaCl?

• 1.1 M

• 1.7 M

• 0.000017 M

• 0.72 M

Multiple Choice

How many grams of Ca(OH)₂ are needed to produce 500 ml of 1.66 M Ca(OH)₂ solution?

• 0.83 g

• 62 g

• 246 g

• 4.1 g