Write down the changes that will be seen in each instance and explain the reason behind it. Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.

Question

Philoid · Accepted Answer

The changes observe when pieces of blue vitriol were heated in a test tube and on cooling, water was added to it are:

i. On heating, the crystalline structure of blue vitriol broke down to form a colorless powder.

ii. On adding water, the color changes back to blue color.

Explanation: When blue vitriol (hydrated CuSO₄) is heated, it becomes anhydrous and colorless (white).

CuSO₄.5H₂O → CuSO₄ + 5H₂O

(blue) (white)

Now, when water was added, it regained its blue colour and becomes hydrated again.

CuSO₄ + H₂O → CuSO₄.5H₂O

(white) (hydrated)

Write down the changes that will be seen in each instance and explain the reason behind it.Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.

Write down the changes that will be seen in each instance and explain the reason behind it.
Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.