A student wants to obtain pure water from a sample of sea water . Some white solid is found in the residue after the process is carried out for a long time .
To identify the elements inside the white solid , the student carries out flame test . Outline the procedures of the flame test and state the observable change(s) .
ENGLISH~
chemistry
2006-11-23 4:45 am
回答 (1)
2006-11-23 4:58 am
✔ 最佳答案
In carrying out a flame test, a nichrome (or platinum) wire is repeatedly heated in a non-luminous Bunsen flame and cleaned with concentrated hydrochloric acid until the wire imparts no colour to the flame. Dip the cleaned end of the wire into concentrated hydrochloric and stick a little of the powdered compound onto the wire. Put the compound into the cooler part of a non-luminous flame (blue flame) and observe the flame colour.A bright yellow flame is observed.
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