A technician separates a solid product from the solvent and excess reactant, then transfers the product from the reaction vessel to a collection container.
Which event could lower the mass of product finally collected even though the product had already formed?
Some solid product remains inside the reaction vessel during the transfer
Some solvent remains in the product when its mass is measured
Some excess reactant remains after the limiting reactant is used up
The collected product is dried to constant mass before it is measured
151 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.