Why should we clean the wire loop(a fresh cotton bud be used)?
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flame test is an analytic procedure used in chemistry to detect the presence of certain elements, primarily metal ions, based on each element's characteristic emission spectrum. Samples are usually held on a platinum wire cleaned repeatedly with hydrochloric acid to remove traces of previous analytes. The compound is usually made into a paste with concentrated hydrochloric acid, as metal halides, being volatile, give better results.
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