An industrial chemist prepares a sample of hydrated ammonium iron(II) sulfate (Mohr's salt) from iron filings, sulfuric acid, and ammonium sulfate. After recrystallisation and drying, the percentage yield of the pure crystalline product is determined to be 74%74\%74%.
Give two reasons why the percentage yield of this purified crystalline product is less than 100%100\%100%.
157 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.