Solutions Review, part 1

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

Molar mass of NaOH: 39.997 g/mol

• 0.8 M

• 1.5M

• 3.0M

• 6.0M

Which of the following is the correct formula for calculating molarity?

• moles/liters of solution

• moles/kg of solvent

• # particles/Avogadro's #

• theoretical yield/actual yield

How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 0.125 L?

• 1074 mol

• 0.069 mol

• 1.07 mol

• 62.7 mol

Which solution is more diluted?

Solution 1:

1000 mL of water

60g of salt

Solution 2:

500 mL of water

60 g of salt

• Not enough information to tell

• Solution 1

• Solution 2

• They are equally diluted

Calculate the mass percent of solution, if there is 100 g of sugar and 400 g of water

• 30

• 25

• 20

• 15

Answer explanation

percent mass = (grams solute / grams SOLUTION ) x 100%

solution = 100 g sugar + 400 g water = 500 g

percent mass = (100 g sugar / 500g solution ) x 100%

=20%

Solvent is best defined as-

• a mixture in which the substances are spread out evenly between one another and cannot be told apart
• the ability of a substance to dissolve in another substance
• a substance that dissolves in another substance
• a substance into which another substance dissolves

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

Another name for a homogeneous mixture is 

• an element.
• a solution.
• a compound.

Electrolytes

• don't conduct electricity

• conduct electricity

Milk and fog are examples of __________________.

• suspensions

• colloids

• solutions