Analysis of inorganic compoundsEdexcel A-Level Chemistry: Flashcards

What these 13 flashcards ask

How do you test for a carbonate ion?
Ionic equation for a carbonate and acid.
Ionic equation for a hydrogencarbonate and acid.
How is carbon dioxide identified?
How do you test for sulfate ions?
Ionic equation for the sulfate test.
Why is acid added before barium chloride?
How do you test for ammonium ions?
Ionic equation for the ammonium test.
Which gas turns damp red litmus paper blue?
Why must litmus paper be damp in the ammonia test?
Which acid is used before the silver nitrate halide test?
Why test for carbonate before sulfate and halides?

Exam questions on Analysis of inorganic compounds

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
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
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

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).