Concentration and solution stoichiometry
≈ 48 minConcentration and solution stoichiometry
Concentration describes how much solute is present in a stated volume of solution. In molar concentration calculations, c = n/V, where c is in mol dm⁻³, n is in mol and V is in dm³. Convert cm³ to dm³ by dividing by 1000 before substituting. Concentration is not simply an amount: 0.10 mol in 0.10 dm³ is more concentrated than 0.10 mol in 1.0 dm³. In a reaction calculation, find moles from concentration and volume, then use the balanced equation ratio before converting again if required.
Work it through
A solution contains 0.20 mol solute in 500 cm³. First convert: 500 cm³ = 0.500 dm³. Then c = 0.20/0.500 = 0.40 mol dm⁻³. If this solution reacts, the 0.20 mol is the quantity you take into the coefficient ratio, not the concentration value alone.
Mastery target
Calculate concentration and use it as a starting point for a balanced-equation solution calculation with correct volume units.
Which volume is equal to 500 cm³?
Name the key chemistry term from Concentration and solution stoichiometry that best fits the explanation and visual model.
Calculate the concentration of 0.20 mol solute in 0.500 dm³ solution, in mol dm⁻³.
Which statement corrects a common misunderstanding in Concentration and solution stoichiometry?