Analysis of inorganic compoundsEdexcel A-Level Chemistry: Mind map

Exam questions on Analysis of inorganic compounds

1. A school technician has labelled three white solids as sodium carbonate, sodium hydrogencarbonate and sodium sulfate, but the labels have come off. She has dilute hydrochloric acid, limewater and aqueous barium chloride.
   Write an ionic equation, with state symbols, for the reaction of hydrogencarbonate ions with dilute acid, and state how the gas formed is identified.2 marks
2. An environmental analyst tests a sample of river water for dissolved sulfate ions using acidified aqueous barium chloride.
   Adding excess acidified barium chloride to 25.0 cm³ of the sample gives 0.466 g of dry barium sulfate (M = 233 g mol⁻¹). Calculate the amount of sulfate ions in the sample and their concentration in mol dm⁻³.2 marks
3. A farm technician is analysing a fertiliser that is believed to be ammonium sulfate, (NH₄)₂SO₄.
   Describe how you would show that the fertiliser contains ammonium ions. Include the observation and an ionic equation with state symbols.3 marks