Waec Model Questions Vol1 2020 Chemistry Question 2
Practice practical question 2 from the 2020 Waec Model Questions Vol1 Chemistry examination. This question covers Flame test, Periodic trends, Solubility in acids, Emission of light, Energy‑wavelength relationship .
A student carries out a flame‑test investigation to identify the metal ion present in an unknown aqueous sample (Sample U). The student prepares four standard solutions containing 0.10 M of Na⁺, K⁺, Ca²⁺ and Ba²⁺ respectively. A small amount of each solution is placed on a clean nichrome wire loop and introduced into a non‑luminous Bunsen‑burner flame. The observed flame colours are recorded. The same procedure is then performed with Sample U. In addition, the student adds a few drops of dilute HCl to a separate portion of Sample U and notes whether a precipitate forms.
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This is Waec Model Questions Vol1 2020 Chemistry Question 2. It is one of the practical questions from the 2020 Waec Model Questions Vol1 Chemistry examination.
The question covers Flame test, Periodic trends, Solubility in acids, Emission of light, Energy‑wavelength relationship .
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