In order to form a galvanic battery, what are the requirements for the electrolyte?

First of all, find out the composition conditions of the galvanic battery: 1. There are two metals (or graphite) with different activity (PT and graphite are inert electrodes, that is, they will not gain or lose electrons) 2. The device forms a closed loop. 3. Spontaneous redox reaction should occur, so the condition of the electrolyte is to be able to have a spontaneous redox reaction with the electrode

Hello classmates, I want to make up the galvanic battery on the electrolyte.

and electrodes, the electrolyte must be able to spontaneously redox react with one of the two electrodes.

For example, iron and carbon are used as electrodes, and the electrolyte solution is copper sulfate, at this time, when the two electrodes are linked, they constitute a galvanic battery, the fundamental reason is that copper sulfate can react with iron, but it is also a copper sulfate solution.

Make an electrolyte, but the electrode is replaced with two carbon rods, and at this time it will not be able to form a galvanic battery, understand? Happy learning!

It can react with one of the electrodes. (I don't know the specific solubility or something) The pole that is reacted is the positive electrode (it should be, I forgot).。。Carbon rod for the negative electrode.

You can disassemble the lead-acid battery (the broken one will do) and take out the negative electrode (not the brown one) inside. 2 can form a rechargeable battery Put 2 electrodes into a glass and add battery water (very dilute sulfuric acid solution, you can also use tap water directly).Seal it on top again, leaving a hole.

You want to make which pole is positive and which pole is negative. (It bubbles when charging.) It's fun, hehe].

I think it can react with the negative electrode, I think. ]

The role of the electrolyte in a galvanic cell is:

Loops are formed. Provide a reaction environment (acidic, alkaline);

Some provide reactants.

For example, the electrolyte solution is generally involved in the cathode reaction, such as the copper-zinc galvanic battery, where the hydrogen ions in the electrolyte solution obtain electrons to generate hydrogen on the positive copper sheet.

Because of the electrode potential, electrons can follow the wire through the external circuit to the positive electrode, if there is no closed loop, the electrolyte solution directly on the negative electrode to get electrons.

The first reacts with the anode material, and the second conducts electricity. For example, in copper-zinc galvanic batteries, the role of the electrolyte solution dilute H2SO4 is: first, it reacts with Zn to provide a redox reaction; Second, in the solution, the cations move to the positive electrode, and the anions move to the negative electrode, which plays the role of conduction.

1. The function of the electrolyte solution in the galvanic battery is to react with the anode material and play a conductive role in cracking dust.

2. For example, in the copper-zinc galvanic battery, the effect of the electrolyte solution dilute H2SO4 is: first, it reacts with Zn to provide a redox reaction; Second, in the solution, the cation moves to the positive electrode, and the anion moves to the negative electrode, which plays a conductive role for leakage.

<> reacts with the anode material and plays a role in conducting electricity. For example, in copper-zinc galvanic batteries, the role of the electrolyte solution dilute H2SO4 is: first, it reacts with Zn to provide a redox reaction; Second, in the solution, the cations move to the positive electrode, and the anions move to the negative electrode, which plays the role of conduction.

Because copper and NaCl cannot react on its own, NaCl does not participate in the reaction when a galvanic cell is formed, and NaCl only plays a role in conducting electricity.

If there is a spontaneous redox reaction between the electrode and the electrolyte solution (i.e., a redox reaction that can occur under normal conditions when a galvanic cell is not formed), in this case, the electrolyte will participate in the reaction, the negative electrode is the active metal that loses electrons, and the positive electrode is the cation of the electrolyte that gains electrons.

If there is no spontaneous redox reaction between the electrode and the electrolyte solution, in this case, the electrolyte will not participate in the reaction, and the negative electrode will still be an active metal and lose electrons, and the positive electrode will become O2 electrons.

1. The purpose of using the salt bridge in the two-liquid battery is to eliminate the liquid potential, and the anions and cations in the salt bridge enter the cathode pool and the anode pool through directional movement to form a closed loop of the two-liquid battery.

2. Liquid potential refers to the formation of an electric double layer at the junction of the solution due to the separation of positive and negative charges due to the different migration rates of positive and negative ions diffusion through the interface, when two electrolytes with different compositions or activities are in contact, and the potential difference is called liquid junction diffusion potential, referred to as liquid joint potential. The wetted potential is one of the main causes of potential analysis errors. By inserting a salt bridge between the two solutions to replace the direct contact between the two solutions, the purpose of reducing and stabilizing the joint potential can be achieved.

3. The solution used as a salt bridge needs to meet the following conditions: The migration rate of anions and cations is similar; The concentration of the salt bridge solution should be large; The salt bridge solution does not react with the solution or interfere with the assay. The basic principles of the salt bridge action are:

Due to the high concentration of electrolytes in the salt bridge, the diffusion at the two new interfaces is mainly from the salt bridge, so the joint potential generated at the two new interfaces is stable. In addition, since the migration velocity of positive and negative ions in the salt bridge is almost equal, the liquid potential generated at the two new interfaces is in opposite directions and almost equal in value, so that the liquid potential is reduced to a minimum or even close to elimination. Commonly used salt bridge solutions are:

saturated potassium chloride solution, and so on.

4. This question is actually very profound. There is no need to understand in middle school, this is the content of university. If you are interested, you can go to the chemistry department, but don't go to the chemistry department of the normal school, hehe, it's nothing else, the job is not too easy to find a job.

1. First see whether the total reaction needs the solute in the electrolyte solution to participate in the reaction, and if so, then the solution must contain the corresponding ions.

If the total reaction is: 2Fe3+ +Cu=2FeL2+ +Cu2+, soluble iron salts such as FeCl3, Fe(NO3)3, Fe2(SO4)3 can be used for the solution.

2. If the solute in the solution is not required to participate in the reaction, as long as the solute does not interfere with the main reaction, it can be selected.

For example, to design experiments to study the oxygen absorption corrosion of steel, NaCl, KNO3, NaOH and so on can be selected.

However, CuSO4 cannot be used, because if CUSO4 is used, the positive electrode will not be oxygen for electrons but copper ions.

H2SO4 cannot be used, because if H2SO4 is used, it is not oxygen absorption corrosion but hydrogen evolution corrosion. The positive electrode is not oxygen for electrons, but hydrogen ions for electrons.

Choose electrolytes that can react with reactive metals and cannot react with inactive metals.

Separate the metal positive and negative electrodes, that is, one of the reactions is the negative electrode, and there are bubbles as the positive electrode.