一條 AL CHEM的實驗題

卡迪斯圖達

2.There are two method to prepare copper (1) chloride
The 1st method is to mix a copper turning and copper (2) chloride in the presence of sodium chloride The second method is th mix the copper(2)chloride with the sodium sulphate (4) .
(a) why was heat required in 1st method and not in method 2
(b)what causes the dark brown colour in 1st method.
(c)why does the solution in contact with the white solid in 1st method slowly turn blue on standing?

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