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Displacement reaction of copper by sodium will work well if ethanol is used to precipitate the sodium sulfate. Copper chloride is soluble in ethanol (>50 g/100 mL) while sodium sulfate is not. A mixture of concentrated salts in water, followed by dilution with fair amounts of ethanol will allow recovery of high-purity copper chloride dihydrate after proper ...

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It is true that bismuth burns with a bluish flame in the presence of air to form bismuth trioxide($\ce{Bi2O3}$) as @M.Farooq mentioned. Bismuth pentoxide is not a pure compound but a mixture of various compounds like water, bismuth trioxide and bismuth tetroxide. It is also not stable at strong heat, decomposing at 393 K. Also, there is no direct preparation ...

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Many elements have multiple valencies. The most common oxidation state of Bi is +3. Bismuth (V) is also possible. Read more here on Bismuth oxides.

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