Question 9
Meat and plant leaves are burned, and a glass plate is held above them. Cobalt chloride is used on the liquid drops that form. What is seen?
The right answer is the one marked above.
Its colour turns from blue to pink. The conclusion is that the drops on the glass plate are water (H2O), so water was a component of the material burned.
The method matters as much as the result: crush the material, heat it in a crucible until the water leaves, and catch what rises on a glass plate held above it.