Question

When buttermilk spills on a marble floor, a stain appears after sometime. Why

Answer 1

Answer:

Buttermilk is acidic. Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite, which are attacked by acid. But it's a slow reaction.

Answer 2

When buttermilk spills on a marble floor, a stain appears after some time. The reason for this is:

• Different kinds of stones such as metamorphic rocks and chemicals such as calcium carbonate are used in the construction of marble. On the other hand, buttermilk is acidic in nature as it contains lactic acid.
• When buttermilk spills on the marble floor, the lactic acid of the buttermilk and the calcium carbonate of the marble reacts to form carbon dioxide and water which causes corrosion and damages the part of the floor where the milk has been spilled. The reaction is as follows: $CaCO_3+H^+$ → $Ca^2^++CO_2+H_2O$