- Zinc copper cell (reduction-oxidation)
- How to measure?
- Battery meter (galvanometer)
- How Many Turns?
- Electrolyte test (pure water vs. vinegar)
- Reverse electrodes (polarity)
- Electrolyte (strong acid test)
- Electrolyte (salt test)
- Electrode (distance test)
- Electrolyte (temperature test)
- Electrode (surface area test)
- Standard cell
- How much electrolyte does a single cell need?
- The battery and electromagnetism
Zinc Copper cell - example of reduction-oxidation reaction. Created by Brit Cruise.
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- CH3COOH is the main constituent of vinegar. Zinc oxide is amphoteric, so I'm assuming that zinc is more electronegative than copper and accepts electrons during the reaction. CH3COOH being acidic must be an oxidising agent. Therefore when the current is on, CH3COOH breaks down into two ions, CH3CO+ and OH-, and copper is oxidised, hence explaining the bubbles on copper. Am I right? I can't explain the bubbles on zinc before the current is turned on...(10 votes)
- Actually, when a metal reacts with an acid, a salt and hydrogen gas is produced.So when Zinc [ being a metal] reacts with ethanoic acid [ main constituent of vinegar], a salt Zinc ethanoate is produced along with hydrogen gas. We see the bubbles only because of the formation of hydrogen gas.(12 votes)
- This blew my mind. What did happen?(4 votes)
- Here's what I think happened: upon adding the Zinc to the vinegar (or acetic acid CH3COOH) it reacts to form hydrogen gas (the bubbles) in the reaction Zn(s) + 2CH3COOH(aq) = Zn(CH3COO)2(aq) +H2(g); during this reaction the Zinc is Oxidised (it looses electrons) and becomes positively charged: *Zn = Zn^2+ + 2e-*. This is where I'm having trouble; I think the copper doesn't produce bubbles as it needs an oxidising agent present or the reaction is very slow because copper has what's known as a positive reduction potential which just means that it is more likely to be reduced (gain electrons) than oxidised (lose electrons). When the wires are connected the electrons released from the Zinc produce a current and move to the copper; this gives the H+ ions in the acidic solution a chance to combine and form H2(g) which is released as bubbles.(3 votes)
- what job does vinegar do there??(3 votes)
- Vinegar is an acid. When acids touch metal, typically hydrogen gas is released. This hydrogen gas is our bubble. The vinegar also serves as an electrolyte by aiding electron migration or electric flow.(2 votes)
- Why was he using vinegar? Would water work?(3 votes)
- Probably not, Vinegar has special acidic properties that make it better than water for this purpose.(1 vote)
- How come when the two wires connect the copper does not erode?(3 votes)
- Great question. Perhaps I should observe the reaction over the course of 24 hours and post the new evidence.(1 vote)
- If you put a light bulb on the end with the copper wire instead of the wire would the light bulb light up?(1 vote)
- What is zinc?!(2 votes)
- Zinc is a metallic element with the symbol Zn and atomic number 30. It is the first element in group 12.(1 vote)
ocet miedziany drut cynkowy gwóźdź bąbelki na cynku brak bąbelków na miedzi połącz druty bąbelki tworzą się na miedzi