Ionic equations and tests for ions and gasesIB MYP Chemistry: Mind map

Exam questions on Ionic equations and tests for ions and gases

1. A technician at a water-treatment laboratory in Nairobi mixes a colourless solution of silver nitrate with a colourless solution of sodium chloride. A white solid forms at once, and the mixture is then filtered. The technician writes the reaction first as a full equation and then as an ionic equation.
   Explain why a white solid forms when the two solutions are mixed.2 marks
2. A student in a school laboratory in Manchester is given three bottles of colourless solutions labelled sodium carbonate, sodium sulfate and ammonium chloride. A technician has mixed up the labels, so the student must identify each solution using chemical tests.
   Describe how the student could use dilute hydrochloric acid to show which bottle contains sodium carbonate.2 marks
3. A metal-plating factory in Pune releases waste water into a drain. An environmental science club collects three samples, X, Y and Z, and adds a few drops of sodium hydroxide solution to each. Sample X forms a blue precipitate, sample Y forms a green precipitate and sample Z forms a red-brown precipitate. Each sample contains only one type of metal ion.
   Identify the metal ion present in each of samples X, Y and Z.3 marks