Can the oxygen obtained by water electrolysis be used for human breathing?

1. No, you can't. Because of the electrolytes in the water.

It is complex, and gas impurities are generated during the electrolysis process. For example, chlorine.

2. Any method can be used, as long as the impurities are removed and diluted. The most economical is the air separation method.

3，20%-30% 。Excessive concentrations can cause oxygen toxicity.

4. Oxygen partial pressure meter.

5. The oxygen production capacity of different plants is different. The light and effect is that the tropics are greater than the cold zone, and the broadleaf is greater than the coniferous, but the respiration at night is the effect.

It's the same. Unless you compensate for the natural light at night with an artificial light source. No matter how large your confined space is, half of it will always shine on the sun like the earth.

6, same upstairs.

a, positive electrode. b, graphite. Metals produce impurities.

c, I haven't calculated, I don't know about this. However, hydrogen and carbon dioxide must be taken into account in sealed spaces.

** Question. Otherwise, the space air pressure will increase more and more until **.

1 Yes Electrolyzed water has no impurity gases (except for non-toxic hydrogen) 2. Electrolyzed water.

3. The volume percentage is more than 20.

4. High-precision dynamic oxygen partial pressure sensor.

5. Tropical broad-leaved plants can be calculated to calculate the amount of oxygen and what people need - between 700nm.

that'all 3q

1. Cathode oxygen.

2 It is best to use graphite.

3 It's hard to say that you didn't say how much water was electrolyzed.

Supplement. 2 Plant photosynthesis cryogenic separation.

3 21% of the rest is 78 nitrogen, because people have to deal with this environment, rescue with 100%, with not too long, infants are susceptible to oxygen poisoning, blindness. Now medical recommendations are about 60% oxygen, and helium is used for diving as other gases.

4. Zirconium dioxide stabilized with yttrium oxide can continuously analyze constant oxygen.

The particles that do not change in water electrolysis are hydrogen atoms and oxygen atoms.

Under the condition of electricity, the molecules that make up water are broken down into hydrogen atoms and oxygen atoms, and then every two hydrogen atoms are recombined into hydrogen molecules, and every two oxygen atoms are recombined into oxygen molecules. And in this process the atoms do not change, so the atoms are the smallest particles in the chemical change.

Water can be decomposed into hydrogen and oxygen under the action of direct current. When electric sparks pass through hydrogen and oxygen mixed with gas, they are synthesized into water. Both experiments show that water is composed of two elements, hydrogen and oxygen, and from the experimental results, it can also be known that their volume ratio is 2 1.

Notes:

The voltage used in electrolysis of water and the concentration of the acid solution have a strong relationship with the speed at which the gas is released. When the voltage of 18 24 volts and the concentration of sulfuric acid is 1 6 1 8, the gas is produced on the poles at a faster rate, the bubbles are large, and it only takes 4 5 minutes to accumulate a certain amount of gas, and a clear volume ratio is seen.

The hydrogen peroxide generated at the anode is relatively stable in an acidic solution and is not easy to decompose oxygen, so the volume of oxygen is low. The difference in solubility of oxygen and hydrogen in water is secondary.

In the case of synthetic water, the tubing must be tightly fixed to the iron frame, preferably with a layer of plastic at the bottom of the glass sink.

<> first prepare the instrument: power supply, two graphite electrodes, wires, distilled water (it is better to add a little sodium sulfate to improve the conductivity), two test tubes (or gas collection cylinders).

After the power is turned on, the gas is collected with a collection device, which is connected to the positive electrode of the power supply, and the oxygen that collects the gas is less.

After the power is turned on, the gas is collected by a collector and connected to the negative electrode of the power supply, and the more gas collected is hydrogen.

Note: Oxygen can ignite the fire, pay attention to safety when collecting the potatoes and stay away from the fire!

There are two main methods of industrial electrolysis for hydrogen production:

1. Alkaline water electrolysis to produce hydrogen.

2. Hydrogen production by electrolysis of water by polymer electrolyte.

The industrialization of electrolyzed water is still in the development stage, and there are still many problems that need to be addressed. For example, electrolyzers usually require high-purity freshwater resources, and direct use of seawater will lead to electrode corrosion and reduced efficiency, while the chlor-alkali industry of electrolysis of seawater requires higher voltages to achieve hydrogen preparation. World digging.

Hydrolysis of water in appliances to produce oxygen.

The chemical reaction equation is:

h o = energized = h + o

At home, find a cup, two pencils, 8 dry batteries, two wires.

1. A cup with water:

2. Two pencils:

Dry battery: <>

4. Two wires

The upper limb or raw material is connected as shown below, and oxygen is produced at the end of the pencil connected to the negative electrode of the battery.

Around 2000, when I was in the first year of junior high school, chemistry talked about the preparation of oxygen, and I thought that electrolysis of water would have hydrogen and oxygen, so I tried it myself, and I did water electrolysis experiments myself, and I also learned the knowledge of some electrode reactions, which used DC6V (DC means DC) and DC280V voltage at that time.

Notes:

To use DC voltage;

If it exceeds 60V, it is not safe, please take precautions, including but not limited to: insulating gloves, goggles, earplugs, anti-arc face screen, arc protective clothing, anti-arc gloves;

The power supply needs to have a fuse and a switch that can trip;

To use relatively clean water, purified water is recommended;

It is recommended to use a graphite electrode (use a dry battery positive carbon rod to keep it clean).

Schematic diagram] <>

Process] I got a wide-mouth canned bottle, filled half a bottle of tap water, started with 6V, and directly stripped 1cm of copper wire as an electrode, and the result was that there were almost no bubbles on the positive electrode, and the hydrogen bubbles on the negative electrode were also very small (below the estimated bubble diameter), and it could not even be called bubbles, it was a very small bubble; Soon (less than half an hour) the water turned blue, the copper wire of the positive electrode was broken, and there was a precipitate at the bottom of the bottle, and the water with the precipitate was boiled, and the precipitate turned black. Then I tried to use aluminum wire as an electrode, which was also aluminum hydroxide; Iron has also tried the same, first green and then reddish-brown flocculents. In the end, the battery cell and carbon rod were used, and there were bubbles at the positive electrode, oxygen.

Because the bubbles are too small and too few, I adjust the voltage, and the maximum can only be adjusted to 9V, and the bubbles have increased, which is not obvious. So I used 4 diodes and a 400V 10UF capacitor to make a bridge rectifier filter circuit, and the measured voltage of the multimeter was about DC280V (never short circuit or touch it by hand!!). After carefully energizing, the bubbles on the positive and negative carbon rods bubbled up a lot, just like when the water was just boiling, and the effect was very good, and the effect I wanted was achieved.

After observing for a few minutes, the power is cut off and things are packed. As a rural baby, I didn't know who to share the joy and questions in my heart at that time, and later told my father Jane, who had studied high school, that he couldn't explain some phenomena and principles clearly. Later, I saw a "Formula Theorem for Middle School Students", which was slightly mentioned in the electrolytic reaction part of chemistry, which was a partial solution.

At that time, DC6V was used to electrolyze salt water, and the smell of chlorine (be careful, chlorine is harmful to the human body), I can't forget it for a long time, and the bottle is full of pale green chlorine.

Summary] The recommended voltage is 24 or 48V (the voltage is too low to see obvious bubbles), and the current is about 1A. Pure water has a large resistance, and the current is very small when it actually bubbles. In fact, the dry battery is thrown into the water, and it also has this reaction, but the bubbles are too small to see.

Batteries need to be disposed of properly and should not be thrown into drinking water or soil, otherwise harmful substances will enter the soil or drinking water and harm future generations.

Advantages: The production process is environmentally friendly, and there is hydrogen as a by-product. Cons:

The speed is slow and the oxygen collection device is complicated. The electrolysis of water is actually a redox reaction, direct current has a positive electrode and a negative electrode, the positive electrode is positively charged so it absorbs electrons, and the negative electrode is negatively charged, so it is given an electric shield. The negative electrode gives hydrogen electrons, which turns hydrogen into hydrogen, and the positive electrode absorbs electrons from oxygen**, so that oxygen becomes 0 valence from negative bivalent, and it becomes oxygen.

Electrolyzed water experimentThe water electrolysis experiment is an experiment that tests the composition of water. According to the product produced during electrolysis, electrolysis can be divided into several types, such as water electrolysis, decomposition electrolyte type, hydrogen release alkali type, oxygen release acid type, etc. Water is made up of two elements, hydrogen and oxygen.

Water is electrified to produce hydrogen and oxygen. The positive electrode produces oxygen, and the negative electrode produces hydrogen. Before and after the chemical reaction, the element species remains the same.

In chemical change, molecules can be divided into atoms, and atoms are indivisible and can form new molecules.

Experimental phenomenon: there are bubbles in the test tube, and the gas ratio of the test tube stool connected to the positive electrode (oxygen) and negative electrode (hydrogen) of the power supply: 1:2 (memorize the formula: hydrogen dioxide one, yang oxygen and anion).

First: add a small amount of dilute sulfuric acid or sodium hydroxide to the water.

Solution. Purpose: To enhance the electrical conductivity of water.

Device: Water electrolyzer.

Experimental Phenomena:1When the power is applied, air bubbles are created on the electric shock.

2.The ratio of the volume of gas produced by the positive electrode to the volume of gas produced by the negative electrode is 1 to 2 to verify the method of gas: the positive electrode --- a strip of wood with sparks--- the re-ignition of the strip --- proved to be oxygen.

The negative electrode --- burns up in the province and produces a light blue flame--- which is hydrogen.

Conclusion: Water is made of the element hydrogen.

and oxygen.