Greta Jimenez
The process of evaporation can help purify water of large contaminants, such as dirt, sticks, or leaves, which are too big to be carried up with water molecules into the atmosphere. However, evaporation does not remove all pollutants from water. For example, when saltwater evaporates, the salt is left behind. Additionally, acid rain, which is formed from chemicals in the atmosphere, can be a product of water evaporation.
| Characteristics | Values |
|---|---|
| Can polluted water be purified? | Yes, through evaporation |
| What happens to the pollutants? | Left behind, like salt |
| What happens to the water molecules? | They evaporate and turn into water vapour |
| What happens to the vapour? | Carried into the sky to form clouds and then rain, snow or hail |
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What You'll Learn
Evaporation can purify water of large contaminants
Evaporation is a process that can be used to purify water of large contaminants. Water molecules are tiny and can only be seen when they clump together to form droplets. These molecules are always moving and will eventually evaporate into water vapour after rain. This vapour rises into the sky, forming clouds, and eventually returns as rain, snow, or hail.
The process of evaporation can help remove some large contaminants from water. For example, big clumps of dirt, sticks, or leaves are too heavy to be carried up with the water molecules into the atmosphere. Thus, when the water evaporates, these large contaminants are left behind.
To demonstrate this, one can perform a simple experiment at home. First, place some dirt in a mixing bowl and cover it with plastic wrap. Ensure the plastic wrap is sealed around the edges of the bowl but loose in the centre. Place a small marble in the centre of the plastic wrap and put the bowl in a sunny location. As the sun heats the dirt, water will evaporate, and the plastic wrap will direct the water vapour towards the marble, where it will condense and collect in a cup.
The water collected in the cup will have fewer large contaminants, such as dirt or leaves, as these would have been too heavy to rise with the water vapour. However, it is important to note that this process does not remove all types of pollutants, and the collected water may still contain other harmful substances. Therefore, while evaporation can help purify water of some large contaminants, it should not be solely relied upon to produce drinking water.
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Salt is left behind after polluted water evaporates
The remaining substance after evaporation is very salty brine, which is removed to get rid of magnesium and sulfate. These minerals can cause gastrointestinal distress in humans.
Some organic matter may also be present in the salt. However, these organics are prone to degradation and are not expected to be present in ancient salt deposits.
The efficiency of the oceanic nitrogen cycle results in reduced concentrations of certain compounds, such as nitrates, when compared to the water in home aquariums. Therefore, the salt collected from evaporated seawater is expected to have fewer impurities.
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Polluted water can form clouds and cause acid rain
When water evaporates, it leaves behind salt and other large particles that are too big to be carried up into the atmosphere. This process of evaporation can help purify water of some of the larger objects it might be mixed with. However, polluted water can still evaporate and recondense, forming clouds and causing acid rain.
Acid rain is rain that contains chemicals from burning fossil fuels. It is formed when water vapour in the atmosphere mixes with other particles, such as those from burning fossil fuels, and then condenses to form clouds. When these clouds release their moisture in the form of rain, the water droplets can be acidic due to the presence of these chemicals.
The process of evaporation and condensation can, therefore, indirectly contribute to the issue of acid rain. While the evaporation of polluted water may not directly result in the same harmful substances being present in the atmosphere, it can still have negative consequences for the environment. The release of chemical pollutants into the atmosphere through human activities, such as burning fossil fuels, can have far-reaching impacts on the water cycle and the ecosystem as a whole.
It is important to note that the purification effect of evaporation is limited to larger particles, and even then, it does not completely remove the possibility of pollution. The salt left behind when water evaporates, for example, can still contribute to water pollution in certain contexts. Additionally, the presence of chemical pollutants in the atmosphere can lead to the formation of acid rain, which has detrimental effects on the environment, including damage to aquatic ecosystems, soil, and vegetation.
Overall, while evaporation can play a role in purifying water, it is not a comprehensive solution to water pollution, and the subsequent condensation of polluted water vapour can lead to the formation of clouds and acid rain, which further exacerbates the problem.
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Water molecules are too small to be seen individually
Water molecules are indeed too small to be seen with the naked eye or even with a traditional microscope. To put it into perspective, if a water molecule was the size of a marble, then an average-sized apple would be as big as the Earth. A single drop of water contains about 1.67 sextillion water molecules, which is more than the total number of grains of sand on all the world's beaches.
The unique shape of water molecules, with two hydrogen atoms attached to an oxygen atom at a 104.45-degree angle, allows them to stick together, creating surface tension. This is why small insects can walk on water. Water molecules can exist in three states: solid, liquid, and gas. This is why we have ice, liquid water, and steam.
Due to their tiny size, individual water molecules cannot be counted directly. Instead, scientists use methods like Avogadro's Number and weighing samples to estimate their quantities. Avogadro's Number, a key concept in chemistry, states that one mole of any substance contains approximately 6.022 x 10^23 particles (atoms or molecules). By knowing the mass of a sample and the molar mass of the substance, scientists can calculate the number of moles and thus the number of molecules present. This is known as 'counting by mass'.
Another technique used to estimate the number of molecules in gases is volume measurement. According to the Ideal Gas Law, one mole of gas at standard temperature and pressure occupies about 22.4 liters. Therefore, by knowing the volume of a gas, we can determine the number of moles and subsequently the number of molecules it contains.
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Water purification can be achieved through a process involving evaporation
During evaporation, some large pollutants are left behind, such as dirt, sticks, or leaves, which are too big to be carried up with the water molecules into the atmosphere. This natural process can be harnessed to purify water of some of the larger contaminants it may contain.
One method to purify water through evaporation involves using a setup with a mixing bowl, dirt, plastic wrap, a clear drinking glass, a small round marble, and a sunny ledge or warm surface. First, the plastic wrap is carefully placed over the bowl, sealing the edges to prevent water vapour from escaping while keeping the centre loose. The bowl is then placed in a sunny location, and the marble is placed gently in the centre of the plastic wrap, helping direct the water condensation into the glass. As the sun heats the water, it evaporates, leaving behind larger contaminants, and the clean water vapour condenses on the plastic wrap and drips into the glass.
Another method for water purification through evaporation is solar distillation, which uses the sun's energy to evaporate water, leaving behind contaminants. This process can be particularly useful in regions with abundant sunlight and limited access to clean water. While evaporation can help remove larger contaminants, it may not be effective against certain pollutants, such as salt, which can be left behind when water evaporates.
Overall, evaporation is a natural process that can be utilised for water purification, especially in regions with ample sunlight, by setting up simple distillation systems that capture the condensed vapour, leaving behind larger pollutants.
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Frequently asked questions
The evaporation process helps purify water by leaving behind large pollutants such as dirt, sticks, and leaves.
Salt is left behind when polluted water evaporates.
The airborne water molecules are carried into the sky to form clouds and then rain, snow, or hail.
The pollutants left behind can be washed away by the condensed water, i.e., rain, snow, or hail.
No, the condensed water should not be consumed. However, it can be used to water plants.
