Calculations with Solutions and Gases
Use this landing page to move quickly between the key quantitative chemistry pages for solutions and gases in Topic 1. Each card links to a focused page covering molar volume calculations, solution concentration calculations and concentrations measured in ppm.
Choose a Calculations with Solutions and Gases Page
Calculations with solutions and gases connect the mole concept to measurable laboratory quantities. These pages build from calculating gas volumes, through using concentration in mol dm−3, to interpreting very small concentrations expressed in parts per million.
Key idea: Quantitative chemistry depends on choosing the correct relationship between amount of substance, volume, concentration and mass, then keeping units consistent throughout the calculation.
Molar Volume Calculations
Revise how the amount of gas in moles links to gas volume, including the use of molar gas volume in calculations.
Concentrations of Solutions
Practise using concentration, volume and amount of substance in mol dm−3 calculations.
Concentrations in PPM
Learn how ppm is used for very dilute concentrations and how to connect ppm values to mass and volume units.
How to Use These Pages
Start with molar volume calculations to link gases to amount of substance. Then move to concentrations of solutions, because many titration and practical chemistry questions require confident use of concentration and volume. Finally, use the ppm page to handle dilute solutions, trace pollutants and very small concentration values.
Exam focus: Always check units before substituting numbers. Volumes may need converting between cm3 and dm3, and concentration calculations depend on whether the question is using mol dm−3, g dm−3 or ppm.
Copyright notice: This revision page, including its written explanations, layout and teaching sequence, is produced for Online Learning System by Dr. Mohammed Al-Fatah. It is intended for student revision and may not be copied, redistributed or republished without permission.