Salt Is Deadly to Snails
Snail and slugs have a foot composed of cells, which can be thought of as bags of organelles inside an aqueous medium surrounded by a cell membrane. This muscle continuously secretes mucus that facilitates their motion. The cell membrane is a semi-permeable phospholipid bilayer. The semi-permeability allows for the selective passage of molecules. Thus, smaller molecules can pass through with ease, while larger ones are prevented from crossing the membrane. Now, animal cells are not composed of water alone. They also contain several ions, including Na+ and Cl-, which form common salt. When salt is sprinkled on them, the salt crystals bind to the moisture on their skin. This creates a highly concentrated NaCl solution, leading to the development of osmotic pressure. When a hypertonic solution surrounds animal cells, they tend to shrivel up due to heavy water loss. Water rapidly travels out of the cell to dilute the salt solution outside. Enough salt can cause the slimy being to die fairly easily from dehydration, which is incredibly painful and gruesome.
International journal of pure and applied zoology