# Lesson Worksheet: Molar Concentrations Chemistry • 10th Grade

In this worksheet, we will practice calculating the molar concentration of a solution from the solvent volume and mass or moles of the dissolved solute.

Q1:

Calculate the volume in L of a 0.125 M boric acid solution containing 0.500 mol of boric acid.

Q2:

A 600 mL solution contains 10.1 g of magnesium chloride. What is the molar concentration of magnesium chloride in this solution? Give your answer in scientific notation to two decimal places. [, ]

• A M
• B M
• C M
• D M
• E M

Q3:

1.0 liter of a sodium chloride solution contains 2.0 moles of sodium chloride. What is the concentration of sodium chloride? Give your answer to 1 decimal place.

Q4:

A 0.80-liter solution contains 0.40 moles of acetic acid. What is the molar concentration of acetic acid in this solution?

Q5:

A student dissolves 25 g of into water to produce a solution with a volume of 500 cm3. What is the concentration of the solution in moles per cubic decimeter? Give your answer to 2 decimal places. [, ]

Q6:

Which of the following values is not equivalent to 1 dm3?

• A1,000 mm
• B1,000 L
• C1,000 cm3
• D1 L

Q7:

Which of the following statements best describes the concentration of a solution?

• AHow reactive a solute is with water
• BThe amount of solvent dissolved in a certain volume of solute
• CThe amount of solute dissolved in a certain volume of solution
• DHow quickly a solute dissolves in a solvent
• EThe smallest amount of water needed to dissolve a solute

Q8:

A 500 mg tablet of acetaminophen was dissolved in 200 mL of water. What is the concentration of the resulting solution? Give your answer in units of moles per cubic decimetre to 3 decimal places. [, , , ]

Q9:

A 1 M solution of is prepared by dissolving 159.5 g of in water to produce 1 litre of solution. [, , ]

What would happen to the concentration if the amount of water was increased so that the total volume of solution is doubled?

• AThe concentration would stay the same.
• BThe concentration would double.
• CThe concentration would halve.

What would happen to the concentration if the amount of used to prepare the solution was doubled?

• AThe concentration would stay the same.
• BThe concentration would halve.
• CThe concentration would double.

Q10:

A solution was prepared by dissolving a certain amount of in 250 cm3 of water. If the concentration of the resulting solution was 0.5 mol/dm3, how much was dissolved? Give your answer to 1 decimal place. [, ]