How do you prove that oxygen can be dissolved in water? Don t talk to me about fish

Find a plastic bottle (mineral water bottles are fine), fill it with water, then make oxygen (as long as it is pure oxygen), put the bottle upside down in the water, insert the oxygen outlet tube into the bottle, fill half of the oxygen, screw the cap under the water, and take out the water bottle. So you get the bottle with the water and oxygen, and when you shake the bottle, you can clearly see that the plastic bottle is deflated because the oxygen melts into the water and the volume decreases.

The main exhaled breath is water vapor, oxygen, carbon dioxide, and nitrogen.

Aim at the cold dry glass and exhale to see the condensation mist on the glass to test the water vapor.

Carbon dioxide and clarified lime water are used to react to precipitate and test carbon dioxide.

There is no need to test the nitrogen, because the nitrogen is not active, and it is still the same when it goes in and out.

The exhaled air can still support combustion for a while, indicating that a small amount of oxygen is also exhaled.

Artificial respiration is the artificial entry of air into the lungs for exchange, and I don't know what your problem means.

I can't get the first question.

Two questions can help you.

The main component of human exhalation is carbon dioxide (CO2).

Test steps: Test equipment: a water tank, a beaker, a straw, lime water.

Test steps: fill the water tank with water, pour the beaker into the water tank filled with water, put one end of the straw into the mouth of the beaker, then blow air, seal the mouth of the beaker with a glass block, then take out the beaker, open a small hole in the glass block, pour in lime water, lime water will become turbid, you can prove it.

When the speed of oxygen into the water is equal to the speed of oxygen in the water, that is, an equilibrium is reached, under certain conditions, when the oxygen dissolves in the water to reach equilibrium, the content of dissolved oxygen in a certain volume of water is called solubility, and the solubility of oxygen in water is affected by the water temperature, the salt content in the water, and the partial pressure of oxygen.

Oxygen in water is a gas dissolved in water, and its solubility is inversely proportional to the temperature of the air. That is, the higher the temperature, the lower the solubility of oxygen; The lower the temperature, the higher the solubility of oxygen.

For example, when the water temperature is 20, 100 volumes of water can dissolve 3 volumes of oxygen, which is equivalent to milligrams of oxygen per liter of water; At 0, 100 volumes of water can dissolve 5 volumes of oxygen, which is equivalent to milligrams of oxygen per liter of water.

The relationship between the amount of dissolved oxygen and water.

The amount of dissolved oxygen in water is closely related to many factors in water. For example, the deeper the water, the lower the oxygen content. This is because the oxygen in the water penetrates from the atmosphere to the water, and the process of infiltration is naturally from the surface of the water to the deep layer of the water. The size of the surface area of water is also related to the amount of dissolved oxygen in the water, and the area of water is large, and the area in contact with air is naturally large, and the amount of dissolved oxygen is also large.

At 20 o'clock, 1 liter of water can dissolve about 30 grams of oxygen, oxygen is insoluble in water, and at 25 degrees Celsius, 100 grams of water can dissolve grams of oxygen. The higher the temperature, the less oxygen the water dissolves. Therefore, in the summer, fishermen use aerators to continuously increase the amount of oxygen dissolved in the water.

The dissolved oxygen criteria are:

Class: Saturation rate 90% or.

Class: 6 mg l

Class: 5 mg l

Class: 3 mg l

Class: 2 mg l

The molecular oxygen in the air dissolved in water is called dissolved oxygen, and the content of dissolved oxygen in water is closely related to the partial pressure of oxygen in the air and the temperature of the water. Under natural conditions, the amount of oxygen in the air does not change much.

At 0, the maximum volume of dissolved oxygen can be dissolved in 1 volume of water, and at 20 1 atm, the solubility of oxygen is volume. Chemically speaking, oxygen is insoluble in water, which is less than a volume of micro-solubility that supports the survival of countless marine organisms.

Oxygen (oxygen), chemical formula O2. Chemical formula: , colorless and odorless gas, the most common elemental form of oxygen.

Melting point, boiling point -183 . Not easily soluble in water, about 30ml of oxygen is dissolved in 1L of water. Oxygen accounts for about 21% of the air.

Liquid oxygen is sky blue. Oxygenation is a blue crystal. It is not very active at room temperature, and it is not easy to interact with many substances. However, it is very active at high temperatures and can be directly combined with a variety of elements, which is related to the electronegativity of oxygen atoms second only to fluorine.

Oxygen is not easily soluble in water, about 30ml of oxygen is dissolved in 1L of water.

The highest amount of gas dissolved in a certain amount of solvent at a certain temperature and pressure is called the solubility of the gas.

It is usually expressed as the maximum volume dissolved in 1 volume of solvent at a constant temperature. For example, if hydrogen can be dissolved in 100ml of water at 20 hours, it is expressed as water, etc.

The solubility of gas is not only related to the nature of gas and solvent properties, but also related to temperature and pressure, and its solubility generally decreases with the increase of temperature.

Regarding the solubility of gases dissolved in liquids, in 1803 the British chemist WHenry, based on the study of dilute solutions, summed up a law called Henry's Law.

At normal atmospheric pressure, there is a small amount of oxygen dissolved in water, which is the reason why underwater life can survive, but if oxygen is soluble in water or easily soluble in water, then life on land cannot be maintained, in summary, oxygen is slightly soluble in water!

Oxygen is not easily soluble in water, and under normal circumstances, only 30 ml of oxygen can be dissolved in 1000 ml of water.

But there is still some dissolved oxygen.

There's this experiment in some high school textbooks, which is, "How do you prove that oxygen is soluble in water?" ”

Oxygen is soluble in water, and 1 liter of water can dissolve about 35 ml of oxygen.

O2 is insoluble in water but not insoluble in water Dissolve 30ml of oxygen in 1L of water at standard atmospheric pressure Fish are not mammals and do not need to breathe air directly.

So it will not suffocate if it lives in water for a long time.

But fish also need oxygen to live.

Therefore, the fish use the mouth and gill cover to open and close alternately in the water, so that the water continues to flow through the gills.

The gills take oxygen from the water and excrete carbon dioxide from the water.

Therefore, fish breathe by gills.

Fish have gills that filter out oxygen dissolved in the water and supply breathing.

Whereas, people have lungs and can only absorb oxygen from the air.

Oxygen is insoluble in water does not mean that there is no oxygen in the water, and 30ml of oxygen is dissolved in 1L of water at standard atmospheric pressure.

Water is hydrogen 2 oxygen 1, and that's what fish use!

Oxygen is insoluble in water does not mean that there is no oxygen in the water. h2o

Solubility: Not easily soluble in water Dissolve 30ml of oxygen in 1L of water at standard atmospheric pressure.

Oxygen is not insoluble, it is insoluble. We are used to saying that it is insoluble.

- Chosen by questioner2007-11-30 20:54:04.

Dissolved oxygen refers to oxygen dissolved in the molecular state of water, i.e., O2 in water, which is denoted by DO. Dissolved oxygen is an indispensable condition for the survival of aquatic organisms. One of the ** of dissolved oxygen is that when the dissolved oxygen in the water is not saturated, the oxygen in the atmosphere seeps into the water body; The other** is the oxygen released by plants in the water through photosynthesis.

Dissolved oxygen varies with temperature, air pressure, and salinity, generally speaking, the higher the temperature, the greater the dissolved salt, and the lower the dissolved oxygen in the water; The higher the air pressure, the higher the dissolved oxygen in the water. Dissolved oxygen is not only consumed by reducing substances such as sulfides, nitrites, and ferrous ions in water, but also by the respiration of microorganisms in water and the oxidative decomposition of organic substances in water by aerobic microorganisms. Therefore, dissolved oxygen is the capital of the water body and the expression of the self-purification ability of the water body.

The dissolved oxygen in natural water is close to the saturation value (9 ppm), and the dissolved oxygen content decreases when the algae blooms vigorously. Water pollution by organic matter and reducing substances can reduce dissolved oxygen, for the aquaculture industry, dissolved oxygen in water has a vital impact on the survival of aquatic organisms such as fish, when dissolved oxygen is less than 4mg L, it will cause fish suffocation and death, for humans, the dissolved oxygen content in healthy drinking water shall not be less than 6mg L. When the rate of dissolved oxygen (DO) consumption is greater than the rate of oxygen dissolution into the water, the content of dissolved oxygen can approach 0, and the anaerobic bacteria can multiply and deteriorate the water, so the size of dissolved oxygen can reflect the pollution of the water body, especially the degree of organic pollution, which is an important indicator of the degree of water pollution and a comprehensive indicator of water quality [2].

Therefore, the measurement of dissolved oxygen content in water is of great significance for environmental monitoring and the development of aquaculture.

2007-11-30 20:15:57 - Whistleblowing.

In fact, water has a faint ionization, and oxygen is slightly soluble, so it can exist in water.

Oxygen is not easily soluble in water.

1. The initial stage of the formation of the Earth's atmosphere is anaerobic. The primordial atmosphere was reductive and filled with gases such as methane, ammonia, etc. There are two reasons for the production of oxygen in the atmosphere, one is the abiotic photolysis of water, and the other is photosynthesis in which living organisms participate. There are many organisms in the atmosphere that photosynthesize.

2. This leads to a transition from a reducing atmosphere to an oxidizing atmosphere. The hydrogen produced by photolysis of water can be re-oxidized into water and returned to Earth without diffusing into outer space, thus preventing water loss from Earth. At the same time, photosynthesis also accelerates the accumulation of oxygen in the atmosphere, profoundly altering the metabolism and morphology of species on Earth.

3. The oxygen content in the atmosphere reached 35% during the Carboniferous period. The increase in oxygen content leads to the enlargement of insects that rely on osmotic oxygen delivery. In the Carboniferous period, dragonflies with a wingspan of 2 and a half feet were presented.

4. As early as the middle of the 19th century, the British scientist Paul. For the first time, Bert discovered that allowing animals to breathe pure oxygen could lead to poisoning. In a pure oxygen environment greater than half an atmosphere, the human body has a toxic effect on all cells, and long-term inhalation will cause "oxygen poisoning".

5. The pulmonary capillary barrier is damaged, causing pulmonary edema. Pulmonary congestion and hemorrhage seriously affect respiratory function, which in turn causes hypoxia and damage to various organs. In an atmospheric oxygen environment, humans can only survive for 24 hours before pneumonia develops, eventually leading to respiratory failure and suffocation.