Question Video: Flame Color of Barium Salts Chemistry

In which of the following images does the result of the flame test indicate the presence of barium? [A] Image A [B] Image B [C] Image C [D] Image D [E] Image E

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Video Transcript

In which of the following images does the result of a flame test indicate the presence of barium?

In a flame test, we’re adding an ionic solid, a powder perhaps, to a flame. And we’re looking at the colour change. Each colour is characteristic of certain ions. A is a red flame. B is an orange or yellow. C is green. D is blue. And E is purple. To answer this question, we’re going to need to recall what flame colour is characteristic of the barium two plus ion.

A green flame is indicative of barium two plus, boron three plus, or copper two plus. So, we can be pretty sure that the green flame is the one most likely to indicate the presence of barium. A red flame is associated with lithium plus or strontium two plus. An orange or yellow flame is indicative of sodium plus or calcium two plus. A Blue flame like this is most likely indicative of copper plus. While a purple flame, depending on the depth of its colour, is more likely to indicate potassium plus, rubidium plus or cesium plus.

So, of the images given, the one that indicates the presence of barium is flame C, the one with the green flame.

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