Molarity and Solutions Practice

Which of the following usually makes a substance dissolve faster in a solvent?

• agitating the solution

• increasing the particle size of the solute

• lowering the temperature

• decreasing the number of particles

In a dilute solution there is

• no solvent

• a large amount of solute per small amount of solvent

• a small amount of solute per large amount of solvent

• no solute

How do you calculate the number of liters of solution?

• molarity ÷ moles of solution

• molarity × liters of solution

• molarity × mass of solution

• moles of solution ÷ molarity

What is the molarity (M) of a solution containing 56g of solute in .959L of solution? (molar mass of solute = 26 g/mol)

• 22.0 M

• 2.2 M

• 3.4 M

• 0.0022 M

What mass of Na₂SO₄ is needed to make 2500 mL of 2.0 M solution? **you need to convert mol→g

• 178 g

• 284 g

• 356 g

• 710 g

If 2.0 mL of 6.0 M HCl is used to make a 500.0 mL aqueous solution, what is the molarity of the dilute solution?

• 0.024 M

• 0.24 M

• 0.40 M

• 0.83 M

You have 0.750 L of a 2.0 M Fe₃(PO₄)₂ solution. If you dilute it to 0.55 M, what is the new volume and how much water was added?

• 2.73 L; 1.98 L are added

• 0.206 L; 0.544 L are added

• 2.73 L; 0.450 L are added

• 0.206 L; 0.057 L are added

An ionic compound whose aqueous solution conducts an electric current is a(n)

• nonelectrolyte

• nonpolar compound

• electrolyte

• polar compound

Tags

NGSS.HS-PS2-5

At 90 °C, 55 g of KClO₃ is dissolved in 100 g of water. Us the graph to best describe this solution?

• saturated

• supersaturated

• unsaturated

A saturated solution of NH₃Cl is formed from 100 g of water. If the solution is cooled from 70 °C to 50 °C, how many grams of precipitate is formed?

• 38 g

• 50 g

• 10 g

• 20 g

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4