Unit 2: Solutions Review

Which of the following is NOT a unit used to express concentration?

• Molality

• Molarity

• Mass percent

• Density

Molarity is ...

• grams of solute/deciliters of solvent.

• grams of solute/liters of solution.

• moles of solute/liters of solution.

• moles of solute/milliliters of solvent.

What is the molarity of 2.5 mol of NaOH in 12.0 L of solution?

• 0.21 M
• 30 M
• 4.8 M
• 20.8 M

You know the number of grams of solute and the volume of solution.

What is the first step in finding the molarity of the solution?

• Divide grams by molar mass to determine number of moles

• Divide grams by the volume of solution

• Divide the volume of solution by grams

• Divide the number of moles by the volume of solution

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

• 0.8 M

• 1.5M

• 3.0M

• 6.0M

Molality (m) = moles of solute / _________________________.

• kilogram of solvent

• kiloliter of solvent

• kilometer of solvent

• ounces of solvent

What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 Kg of water?

• 2.0 M

• 0.22 m

• 135 m

• 2.0m

What is the mole fraction of a solution containing 75g of ethanol (C3H5OH) in 450 g of water?

Mole fraction = mole solute / total moles solution

• 0.049

• 0.059

• 0.069

• 0.039

Solubility refers to the ____ of solute that can dissolve in a certain volume or mass of solvent, at a certain temperature.

• Mean

• Range

• Amount

• Mode

When a certain amount of solvent cannot hold any more solute it is called a ________ solution.

• Diluted
• Saturated