Molarity & Dilutions

The term molar, which describes a solution's concentration, is written with which of the following units?

• M

• mol

• g

• g/L

You need to make 200 mL of a 0.20 M aqueous solution of sodium chloride. The only available solution is 1.0 M. Determine how to make the needed dilution.

• Add 160 mL to the initial volume

• Add 160 grams to the initial volume

• Evaporate 160 mL from the initial volume

• the experiment cannot be conducted with the materials provided

Calculate the Molarity in a solution containing 40.0 g of NaCl dissolved in 500.0 ml of H2O.

• 0.08 M

• 12.5 M

• 1.37 M

• 0.74 M

A dilution is when

• solute is added to the volume of stock solution

• water is added to the volume of stock solution

• solute is removed from the volume of stock solution

• water is removed from the volume of stock solution

Calculate the grams of NaOH present in 10.0 mL of a 2.0 M NaOH solution.

• 0.80 grams

• 2000 grams

• 0.30 grams

• 5.0 grams

Tags

NGSS.HS-PS1-7

A solution is made by dissolving 0.500 moles of NaCl in enough water to give a final volume of 400.0 mL. What is the molarity of the solution?

• 0.10 M

• 0.40 M

• 1.25 M

• 2.33 M

A 0.50 M solution of NaOH, which contains 0.750 mole of solute, would have a volume, in milliliters

• 0.667 mL

• 1200 mL

• 1500 mL

• 2100 mL

Calculate the volume of a 5M solution that contains 10 moles of NaOH

• 0.5 L

• 1 L

• 2 L

• 4 L

Tags

NGSS.HS-PS1-7

What is a concentrated solution?

• a solution that has a large amount of solute in a large volume of solvent

• a solution that has an equal amount of solute in the same volume of solvent

• a solution that has a small amount of solute in a large volume of solvent

• a solution that has a large amount of solute in a small volume of solvent

Tags

NGSS.HS-PS1-5

Which sweet tea would you expect to taste the sweetest?

• 1.0 M

• 3.0 M

• 3.1 M

• 2.5 M