"What exactly is a mole?" "The units for concentration are so confusing..." This is the area where most people stumble in ...

GCSE Chemistry worksheet on concentration with answers, covering concentration = mass ÷ volume and rearranging the relationship to calculate mass or volume. Questions use a range of numerical examples ...

This resource is a basic worksheet on working with concentration for Grades 9 to 10. It introduces the concentration formula, shows students how to rearrange it to solve for concentration, moles, and ...

Editor’s note, September 2026: This article has been updated with an interactive calculator, worked examples using named reagents, and a concentration unit conversion table. The serial dilution ...

Calculate concentration from absorbance, or solve A = εlc for absorbance, path length or molar absorptivity (extinction coefficient). Includes ε presets for dyes, nucleic acids, quantum dots and ...