Explain why desalination processes require large amounts of energy.

Desalination processes require large amounts of energy primarily due to the need to overcome the strong ionic bonds in salt molecules. The methods used, such as distillation and reverse osmosis, involve significant energy input to separate water from dissolved salts. In distillation, water is heated to evaporate, requiring heat energy, while reverse osmosis uses high pressure to force water through a semi-permeable membrane, which also demands substantial energy. As a result, the energy costs associated with these processes can be considerable, impacting the overall feasibility of desalination as a source of potable water.