A student was asked by his teacher to perform a flame test on a solid. He used this method.● dip the tip of a clean platinum wire into hydrochloric acid and then into the solid● adjust the air hole of the Bunsen burner to obtain a non - roaring, non – luminousBunsen flame● place the tip of the platinum wire into the edge of the flame● observe the colour in the flame(a) (i) why is it important that the platinum wire is clean?(iii) Why is it important to use a non - luminous flame?(iv) What color would be observed in the flame if the solid contained sodium ions?
Question
A student was asked by his teacher to perform a flame test on a solid. He used this method.● dip the tip of a clean platinum wire into hydrochloric acid and then into the solid● adjust the air hole of the Bunsen burner to obtain a non - roaring, non – luminousBunsen flame● place the tip of the platinum wire into the edge of the flame● observe the colour in the flame(a) (i) why is it important that the platinum wire is clean?(iii) Why is it important to use a non - luminous flame?(iv) What color would be observed in the flame if the solid contained sodium ions?
Solution
(i) It is important that the platinum wire is clean to ensure that no residues from previous tests interfere with the current test. Any contamination could alter the color of the flame and lead to incorrect conclusions about the presence of certain ions in the solid.
(iii) A non-luminous flame is important because it is hot and colorless. A colored or cooler flame could mask the color produced by the ion in the flame test, making it difficult to identify the ion.
(iv) If the solid contained sodium ions, the color observed in the flame would be a bright, intense yellow. This is characteristic of sodium and is due to the excitation of the sodium ions in the flame.
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