A galvanic cell cannot be formed because no closed circuit is formed.
If you want to form a primary battery, simply use a conductive device to connect the two pools:
1. Insert both ends of a wire into the solution in two beakers (either Can be connected to electrodes);
2. Insert both ends of a salt bridge into the solutions in two beakers;
3. Dip a towel in saturated salt water, then insert the ends into the solution in both beakers.
Composition My Little Creation
It's not a potato that produces electricity! It's a potato primary battery!
Insert the copper electrode and zinc electrode into the cut potato! ! Connect When you turn on the microampere ammeter, you will see that there is a very small direct current passing through. At the same time you can see that the end of the electrocopper will turn green! The zinc electrode that does not change color is the negative electrode!
This is because potatoes are starchy plants and contain a lot of proteases in them. interior. Similar to fruit acid, the water content inside potatoes is also! very high ! There is an electrolytic chemical reaction with the inserted metals with different reactivity! In this reaction there will be electric current! This is the phenomenon of galvanic reaction of the battery!
At this moment, the potatoes only serve as an electrolysis support! It’s not just potatoes! Many fruits and plants high in acids and enzymes have this effect. It's more obvious when you try it with a lemon!
Supplement: Most important! is that the cellular fluid of these fruits contains acidic substances (i.e. it contains H+) and that zincis more active than copper, so the zinc rods continue to lose electrons and become zinc ions which enter the cell fluid and the copper rod accepts the electrons from the zinc rod, so an electric current is shape between the zinc rod and the copper rod. The "Potato Power Clock" currently on the market also has a small boost circuit inside. The more knowledge you have, the less likely you are to be fooled by other people's myths.
A copper rod and a zinc rod are placed in a sodium sulfate solution
The voltage generated by a potato is low. Finally, I connected the small bulb to the wire head and found that the bulb was on. The zinc rod continued to lose electrons and turned into zinc ions entering the fluid of the potato cells, while the copper rod accepted electrons from the zinc rod. . SOthe zinc rod and the copper rod A current forms between them? I thought about it, then stuck it with tape. I was still doubtful. I was doing my homework, and suddenly the power went out, but I hadn't finished my homework yet and there were no candles in the house. I do? At that time my father came and said to me: "I read in a book that potatoes could also be made into batteries to power light bulbs or zinc rods, so I decided to try it myself. I followed the method my father explained to me. Me. I brought 8 potatoes from the kitchen, arranged them in two rows, then took the wires from the broken tape recorder at home and wrapped them around copper rods. Because zinc rods are more active than copper rods: the liquid from potato cells contains them. something that looks like a battery. "Chemical substances! Do you know" At the time, we were still lost in my hometown, which made our whole family think!
I remember one night, I discovered that many vegetables or fruits can generate electricity, so I don't have to worry about power outages. I was curious, so I inserted the copper rods and the zinc rods in a staggered order. , 8 potatoes linked together are enough to light the light bulb After many experiments I can continue to do my homework again I was surprised and happy, and I jumped for joy! >
Later, my father told me that he had explained to me how to make a potato pile.
Copper rods, zinc rods and copper sulfate form a primary battery. What is the phenomenon of the positive and the negative of the electrodes?
It is an alkaline primary battery. gagne to form anions. According to the original battery principle, if both poles are made of metal, the metal with the highest activity is the anode and the metal with the highest activity is the cathode. If one is a non-metal and the other is a metal, the metal is the anode and the non-metal is the cathode. You are asking about a bimetallic primary battery, but metal only has positive valence, so there is a metal activity sequence chart. Zinc loses electrons and shows positive valence, while copper can no longer gain electrons, so electrons are gained from the. electrolyte (sodium sulfate solution), and in the electronic process the electrolyte is supplemented with water and oxygen (distilled water is an insulator, so a solution is used, but the reaction is usually a reaction between water and oxygen. Acid electrolytes primary batteries and alkaline primary batteries are different.erents), then it is 2H2O + O2 + 4e = 4OH-
Reference: High school chemistry textbook (or reference book for this subject) Primary battery part
The rod zinc is the negative electrode and the copper rod is the positive electrode. After connecting the positive and negative electrodes with wires, the battery begins to work (electrons flow from the zinc rod through the wire to the copper rod).
The phenomenon is:
Negative electrode: the zinc rod gradually dissolves (the zinc on the zinc rod loses electrons and turns into zinc ions and enters the solution )
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Zn = Zn2+ + 2e-
Positive electrode: The mass of the copper rod increases and the red copper precipitates on the surface ( copper ions in the solution gain electrons on the copper rod and become copper atoms, which are adsorbed on the copper rod)
Cu2+ + 2e- = Cu