Phytoextraction is a biological method used to extract metals from soils contaminated with metal compounds.
Plants are grown in the contaminated soil, absorbing metal ions through their roots. The plants are then harvested, dried, and burned to produce an ash containing those metal compounds.
In an investigation, plants were grown on land contaminated with copper compounds.
A 2.0 kg sample of the dry ash obtained from these plants was found to contain 136.0 g of copper compounds.
Calculate the percentage by mass of copper compounds in this ash.
110 exam-style questions on Edexcel GCSE Chemistry 5.1 Obtaining and using metals, covering 5.1.1 The reactivity series of metals, 5.1.2 Displacement reactions as redox reactions, 5.1.3 Extracting metals from ores by reduction, 5.1.4 Biological methods of metal extraction, 5.1.5 Resistance to oxidation and recycling metals, and 5.1.6 Life cycle assessment. Each one has a worked solution and a mark scheme showing where the marks go.