Lesson Worksheet: Percentage Concentration Chemistry

In this worksheet, we will practice expressing and calculating the percentage concentration of a solution by its volume or mass ratio.

Q1:

A 250 mL solution of hand sanitizer contains 150 mL of propan-2-ol. What is the percentage concentration by volume of propan-2-ol in this solution? Give your answer to the nearest whole percentage.

  • A15%(v/v)
  • B38%(v/v)
  • C60%(v/v)
  • D17%(v/v)
  • E40%(v/v)

Q2:

A sugar solution was made by mixing 12 g of glucose with 100 g of water. What is the percentage concentration by mass of the glucose in the solution? Give your answer to one decimal place.

  • A12.0%(m/m)
  • B8.3%(m/m)
  • C13.6%(m/m)
  • D10.7%(m/m)
  • E11.4%(m/m)

Q3:

What volume of water must be added to a 125 mL solution of ethanol to change its percentage volume from 40%(v/v) to 35%(v/v)? Give your answer to the nearest whole number.

Q4:

50 g of an anti-inflammatory ointment was found to contain 1.1 g of the main active ingredient. What is the percent by mass of the active ingredient in this ointment?

  • A0.55% (m/m)
  • B2.2% (m/m)
  • C4.4% (m/m)
  • D0.02% (m/m)
  • E0.45% (m/m)

Q5:

50 g of a 26% (m/m) solution was mixed together with 130 g of a 17% (m/m) solution. What is the percentage concentration by mass of the new solution?

  • A19.5% (m/m)
  • B15% (m/m)
  • C5% (m/m)
  • D43% (m/m)
  • E35% (m/m)

Q6:

A 0.75 L bottle of vinegar contains 4% (v/v) of ethanoic acid. What volume of ethanoic acid does the bottle of vinegar contain? Give your answer to two decimal places.

Q7:

A 30 g tube of antiseptic cream contains 1%(w/w) of cetrimide. What mass of cetrimide does the cream contain?

Q8:

Which of the following equations can be used to calculate the percentage by volume, %(/)vv, of a solution?

  • A%(/)=×100%vvvolumeofsolutionvolumeofsolute
  • B%(/)=(×)100%vvvolumeofsolutionvolumeofsolute
  • C%(/)=(+)×100%vvvolumeofsolutevolumeofsolutionvolumeofsolution
  • D%(/)=(×)100%vvvolumeofsolutevolumeofsolution
  • E%(/)=×100%vvvolumeofsolutevolumeofsolution

Q9:

Which of the following equations can be used to calculate the percentage by mass, %(/)mm, of a solution?

  • A%(/)=(+)×100%mmmassofsolutemassofsolventmassofsolution
  • B%(/)=(×)×100%mmmassofsolutemassofsolvent
  • C%(/)=×100%mmmassofsolutemassofsolution
  • D%(/)=×100%mmmassofsolutemassofsolvent
  • E%(/)=(×)100%mmmassofsolutemassofsolution

Q10:

A saline solution was prepared by dissolving 9 g of NaCl in water to produce a solution with a total volume of 1,000 mL. What is the mass/volume percentage concentration, %(m/v), of the saline solution?

This lesson includes 15 additional questions and 39 additional question variations for subscribers.

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