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Edexcel IGCSE Chemistry 2.45 Sodium hydroxide tests

Edexcel IGCSE Chemistry 2.45 Sodium hydroxide tests
Edexcel IGCSE Chemistry syllabusChemistry 4CH1First assessment 2019

Practise the flame-test method, including wire choice, cleaning the wire and explaining how contamination affects the flame colour.

How this is tested

  • explain that a clean platinum wire removes ions that could mask the flame colour
  • select an unreactive, high-melting-point metal wire for heating in a flame test

Question 6(b)(i)

[Maximum number: 2]

This question is about some Group 1 elements and their compounds.

A student does a flame test to see if a white solid contains lithium ions.

They clean a platinum wire before using it for the flame test.

Explain why the student needs to clean the platinum wire.