Why does water change color during water electrolysis

Because the composition of the water molecule is two h atoms with one o atom. If only water is electrolyzed to produce hydrogen and oxygen, they are colorless. But at the anode, hydroxide ions are produced, and the greenish color may be the color of the metal hydroxide formed by trace metal ions in the water.

For tap water, because there are more ions in the water, the conductivity is good, and there will be precipitate during the electrolysis process, so the discoloration of the water in the cup and the suspended matter on the water surface are mainly caused by the chemical reaction of the electrode rod put into the water.

For tap water, because there are more ions in the water, good conductivity, the iron of the positive electrode undergoes rapid oxidation reaction in the case of conduction, and the iron on the iron rod is converted into divalent ferrous ions, and is further oxidized into ferric ions, and the iron ions are combined with various anions contained in the tap water such as chloride ions, sulfate ions, hydroxide ions, etc. to form various iron compounds to present a reddish-brown or brown flocculent precipitate, such as ferrous chloride and ferrous sulfate are green, iron hydroxide, Ferric chloride and ferric sulphate are reddish-brown. Aluminum does not participate in the reaction at the negative electrode, but the hydrogen ions of water get electrons at the negative electrode to form hydrogen, so it will be found that a large number of bubbles are generated on the aluminum rod. If the power anode and cathode of the iron rod and the aluminum rod are interchanged, except that the speed of the electrolysis reaction is the same as the original, the color of the electrolytic product becomes white, that is, the color of the aluminum hydroxide precipitation.

Therefore, the discoloration of the water in the cup and the presence of suspended matter on the water surface are mainly caused by the chemical reaction of the electrode rod put into the water.

It's not dirty. The electrolytic detection instrument uses the iron rod as the anode and the aluminum rod as the cathode, which is connected to the positive and negative poles of the power supply. Because tap water contains a small amount of minerals and is conductive, when the electrolyzer poles are inserted into the tap water and the power is turned on, the electrolysis reaction occurs, forming a large number of ferric iron ions, which melt into the water and make the tap water reddish-brown.

Because purified water does not conduct electricity, cannot be electrolyzed, and does not undergo oxidation, the water will not change color in the end. "If you add some table salt to the purified water, it can conduct electricity, and the purified water will also change color.

The purer the water, the lower the conductivity, because tap water and mineral water contain more electrolytes, with electrolytes, the electrolyzer can conduct electricity in the water, therefore, in order to produce chemical reactions, so there will be the phenomenon of bubbles and boiling. However, because the electrolyte is filtered out, pure water almost does not contain conductive substances, and the electrolyzer will not conduct electricity and no chemical reaction will occur after being put into the water, so there will be almost no precipitation of colored substances.

However, if salt is added to distilled water or purified water, because salt water conducts electricity, there will also be floating, which causes the electrolyzer to electrolyze in tap water, there are usually some substances that are beneficial to the human body, and these substances will also produce color after electrolysis, but it does not mean that it is "unclean" and cannot be used as a basis for judging whether the water quality is good or bad.

Question 1: What happens to water in electrolysis experiments Chemical changes.

Question 2: Is electrolyzed water a physical or chemical change? Why chemical change, because there is a chemical reaction of water electrolysis to produce hydrogen and oxygen.

Question 3: Is the electrolysis of water a chemical change? Water electrolysis is when the water molecule becomes oxygen atom and hydrogen atom first, and then two oxygen atoms become oxygen and two hydrogen atoms become hydrogen.

So it's the creation of new substances. The molecule itself is made up of hydrogen atoms and oxygen atoms rather than molecules, so it creates new matter. Chemical reactions are atomic changes, not molecular changes, don't get confused.

Question 4: What is the change in water electrolysis Someone is impersonating, it may be that your personal information has been leaked.

If you don't pass, you can leave him alone, but considering the risks, it is recommended that you bring your ID card to the People's Bank of China to check whether there are other credit card accounts. If you do not have your authorization, you should report the case in time and contact the bank's credit card center, causing financial and credit losses to yourself.

Question 5: What happens to water in electrolysis experiments Chemical changes.

Question 6: What is the change in the electrolysis of water In the process of electrolysis of water, the particles that change are:

The water molecule , the particle that remains the same, is.

Hydrogen atom and.

Oxygen atoms , the new particles generated are.

Hydrogen molecule and.

Oxygen moleculeThe experiment proves that in chemical reactions.

Molecules can be redivided, and.

Atoms can no longer be divided.

Question 7: Is the electrolysis of water a chemical change? Water electrolysis is when the water molecule becomes oxygen atom and hydrogen atom first, and then two oxygen atoms become oxygen and two hydrogen atoms become hydrogen.

So it's the creation of new substances. The molecule itself is made up of hydrogen atoms and oxygen atoms rather than molecules, so it creates new matter. Chemical reactions are atomic changes, not molecular changes, don't get confused.

Water electrolysis produces water of two natures. The dress itself is still colorless, but after testing with litmus pH reagent, it will appear in different colors. Among them, the yellow and reddish represent acidic water, which is called electrolytic oxidized water; The blue purple color represents alkaline water, which is called electrolyzed reduced water.

Characteristics of electrolyzed oxidized water: weak acidity, similar to the pH value of the human body, and good astringent effect; At the same time, it has oxidation potential, and has a good antibacterial and sterilizing effect of bending fingers: small molecule clusters, strong penetration, good absorption, and easier hydration.

Characteristics of electrolyzed reduced water: weak alkaline, long-term drinking helps to maintain the acid-base balance of the human body, so that the human body is in a weak alkaline healthy environment for a long time; Reduction potential, antioxidant properties, can remove excess free radicals in the human body, slow down aging; Rich in ionic minerals, replenish nutrients and enhance physical fitness; Small molecule clusters, fast absorption, strong permeability, help promote metabolism.

Question 1: Phenomenon and conclusion of water electrolysis There are bubbles in the test tube, and the gas ratio produced by the test tube connected to the positive electrode (oxygen) and negative electrode (hydrogen) of the power supply: 1:2 (memorize the formula: hydrogen dioxygen one, yang oxygen and yin hydrogen).

However, in general, the volume ratio of hydrogen to oxygen is generally greater than 2:1 for two reasons

1.The difference in the solubility of hydrogen and oxygen, hydrogen is insoluble in water, oxygen is not soluble in water (1L of water 30ml of oxygen) but a small part of oxygen is soluble in water, the ratio is greater than 2:1

2.Electrode oxidation consumes a portion of oxygen.

o2= ， h2=

The ratio of the number of molecules of hydrogen and oxygen is 2:1;Mass ratio of hydrogen to oxygen: 1:8;Volume ratio of hydrogen and oxygen: 2:1).

There are eight words that can be simply summed up: positive oxygen and negative hydrogen. Hydrogen dioxyone.

Phenomenon: There are air bubbles in the test tube, and the gas ratio produced by the test tube connected to the positive electrode (oxygen) and negative electrode (hydrogen) of the power supply: 1:2

Conclusion: Water is composed of two elements, hydrogen and oxygen.

Question 2: What is the reaction of electrolysis of water When the electrolyte is dissolved in water or dissolved, under the action of DC power supply, the cations of the electrolyte are reduced at the cathode, and the process of oxidation of the anions of the electrolyte at the anode is called electrolysis. The volume ratio of hydrogen to oxygen produced according to the electrolysis of water is 2:

1. The chemical formula that can be used to further guide water is H2O. It is a chemical reaction.

Principle of water electrolysis:

2H2O – (energized) 2H2 +O2

into oxygen and hydrogen.

Water electrolyzer, why is the tap water after electrolysis so many colors, black, blue, yellow, really.

Water electrolyzer, why is there so many colors of tap water after electrolysis, black, blue, yellow, and really empty? Hello, a water electrolyzer is a device that improves the quality of tap water by electrolyzing it. During the electrolysis process, cations and anions in the water are separated, which changes the chemical and physical properties of the water.

This can cause some color out of the trip blind now in the electrolyzed tap water. Among them, the black color may be due to the high concentration of metal ions such as iron and manganese in the water or other organic substances, which are electrolyzed and then washed by oxygen to form black precipitates. The blue color may be due to the redox reaction that produces some blue compounds such as Cu(OH)2, etc.

The yellow color may be due to the presence of higher concentrations of sulfates, nitrites, etc., which are oxidized into yellow precipitates during electrolysis.