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gives a lilac flame test.
See it on the paper →When potassium reacts with water a flame is seen. State the colour of the flame.
See it on the paper →State the colour of the flame when sodium burns in oxygen. Tick (3) one box. blue lilac red yellow
See it on the paper →A student wants to confirm that a compound contains potassium. The student uses a flame test. State what the student observes if the compound contains potassium.
See it on the paper →The student does a flame test, as shown in Fig. 2.3. flame test wire flame test wire hydrochloric acid flame test wire bunsen burner compound X Fig. 2.3 The flame colour turns from blue to yellow. State the name of the metal ion in compound X. metal ion
See it on the paper →Many correct responses were seen. A common incorrect colour given was yellow.
— Examiner report, February/March 2024, 0654/42 Q2(a)(ii) (Cambridge)
The colour of the sodium flame was sometimes correctly identified as yellow.
— Examiner report, May/June 2023, 0654/43 Q5(c) (Cambridge)
Some candidates were able to recall that potassium gives a lilac flame. Similar colours such as purple or violet were also accepted.
— Examiner report, October/November 2022, 0654/43 Q5(a)(ii) (Cambridge)
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