Question

why dont you The test tube containing alcohol and leaf is never heated directly over fire.

Answer 1

Alcohol is highly inflamable therefore
Alcohol is never directly heated.
If we wish to remove chlorophyll from a leaf,we can dip leaf in alcohol and then in water.This would separate chlorophyll from leaf.
Just like alcohol,leaf is highly inflamable.Thus,we cannot directly heat leaf and alcohol.
Even for iodine test we must first boil leaf in water.

Answer 2

Explanation:

• The tube is immersed in the water bath as it includes alcohol and is readily flammable with alcohol.
• Directly heating the alcohol will catch fire. It's immersed in water to prevent alcohol from catching fire.

• Ethyl alcohol is also referred to as ethanol, the molecular formula of ethanol is $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}.$

Characteristics of ethanol:

• Ethanol is colorless and flammable liquid.

• It has 78.4 C boiling point.

• It has -114.3 C melting point.

• Density is 0.79 $\mathrm{gm} / \mathrm{cm}^{3}$