CAIE IGCSE Chemistry 12.5.4 Use of a Flame Test to Identify the Questions

Work through real CAIE IGCSE Chemistry questions to identify cations from flame colours and describe the flame-test method.

Exam points

describe the flame-test procedure using a salt sample on a wire or splint in a Bunsen flame
identify lithium as red, sodium as yellow and potassium as lilac in a flame test
identify calcium as orange-red or brick-red and barium as light green in a flame test
identify copper(II) from a blue-green flame and distinguish flame colours when interpreting unknown cations

[Maximum number: 1]

A student carries out a flame test on a sample.
The flame colour observed is light green.
Which ion is present in the sample?

$\mathrm{Ba}^{2+}$

$\mathrm{Ca}^{2+}$

$\mathrm{Li}^{+}$

$\mathrm{K}^{+}$

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