Connections to Chemistry Concepts Chemistry Concept Connection to Chemistry Curriculum The distillation of seawater to provide freshwater is perhaps a novel Phase changes way to discuss with students the transitions between the liquid and gaseous phases of water. When looking at vapor pressure and boiling point, the process of Vapor pressure multi-stage flash distillation (MSFD) can add to the discussion. Multi-stage flash (MSF) distillation of seawater can be used as an Boiling example of how boiling can be controlled by changing the pressure on a liquid. Desalination techniques provide the opportunity to discuss the normal boiling point of a pure substance, conditions when boiling Boiling point occurs at a different temperature, and what happens to the boiling point of solutions. The energy expense of simple seawater distillation provides an Boiling point example of problems that can arise due to the boiling point elevation elevation of solutions as distillate is removed. When studying separation techniques involving solutions, the Separation examples of distillation and reverse osmosis to desalinate seawater techniques can show students practical, large-scale, real-world applications. When introducing separation techniques, your students may think of distillation as one of the most familiar ways to separate liquids. Distillation However, they have not considered it a method that has long been used for desalination. This article provides a relevant example of the importance of ions in everyday life, as they must be added back to water that has been Ions desalinated by reverse osmosis, to replenish those lost in the purification process. Both diffusion and osmosis from the article can be used to show molecular motion occurring naturally; while reverse osmosis, a Molecular motion human-controlled process, can be used to show molecular motion that runs counter to that of nature. The explanations and examples given in the article can be used to Diffusion help students use molecular motion to distinguish between diffusion and osmosis.
Connections to Chemistry Concepts Chemistry Concept Connection to Chemistry Curriculum Phase changes The distillation of seawater to provide freshwater is perhaps a novel way to discuss with students the transitions between the liquid and gaseous phases of water. Vapor pressure When looking at vapor pressure and boiling point, the process of multi-stage flash distillation (MSFD) can add to the discussion. Boiling Multi-stage flash (MSF) distillation of seawater can be used as an example of how boiling can be controlled by changing the pressure on a liquid. Boiling point Desalination techniques provide the opportunity to discuss the normal boiling point of a pure substance, conditions when boiling occurs at a different temperature, and what happens to the boiling point of solutions. Boiling point elevation The energy expense of simple seawater distillation provides an example of problems that can arise due to the boiling point elevation of solutions as distillate is removed. Separation techniques When studying separation techniques involving solutions, the examples of distillation and reverse osmosis to desalinate seawater can show students practical, large-scale, real-world applications. Distillation When introducing separation techniques, your students may think of distillation as one of the most familiar ways to separate liquids. However, they have not considered it a method that has long been used for desalination. Ions This article provides a relevant example of the importance of ions in everyday life, as they must be added back to water that has been desalinated by reverse osmosis, to replenish those lost in the purification process. Molecular motion Both diffusion and osmosis from the article can be used to show molecular motion occurring naturally; while reverse osmosis, a human-controlled process, can be used to show molecular motion that runs counter to that of nature. Diffusion The explanations and examples given in the article can be used to help students use molecular motion to distinguish between diffusion and osmosis.
future-water-drinking-sea.docx