Notices
Results 1 to 8 of 8

Thread: Thread: How does the concentration and amount of ions in the electrolyte affect voltage? How does pH of the electrolyte affect the battery?

  1. #1 Thread: How does the concentration and amount of ions in the electrolyte affect voltage? How does pH of the electrolyte affect the battery? 
    New Member
    Join Date
    Sep 2012
    Posts
    2
    I accidentally posted this in general discussion, I'm reposting here because I'll probably get more response here.

    How does the concentration and amount of ions in the electrolyte affect voltage?

    How does pH of the electrolyte affect the battery?

    Does the pH level affect battery life?

    Does pH affect generated voltage?

    If not, what factors affect battery life?

    Why are fruits with higher acidity preferred when making fruit batteries?

    This is for our homework on batteries.


    Reply With Quote  
     

  2.  
     

  3. #2  
    Life-Size Nanoputian Flick Montana's Avatar
    Join Date
    Jul 2012
    Location
    Flatland
    Posts
    5,438
    First, the way the electrolyte dissociates in water determines how strong it will be. The best electrolytes (strongest) will dissociate completely. This allows their charges to be carried more efficiently.

    The relationship between pH and conductivity should be relatively weak. What is important is the composition of the electrodes and the relative ion concentration in the fruit itself. As for pH relation to better batteries, we know certain basic solutions make for strong electrolytes as well. The big difference is that the acid in citrus fruit makes for a good electrolyte, is cheap and easy to obtain, and isn't dangerous.

    Lemons are great battery with copper and zinc electrodes. If I remember my middle school experiments properly, just a couple of them can power an alarm clock.


    "Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us." -Calvin
    Reply With Quote  
     

  4. #3  
    New Member
    Join Date
    Sep 2012
    Posts
    2
    Quote Originally Posted by Flick Montana View Post
    What is important is the composition of the electrodes and the relative ion concentration in the fruit itself.
    Thanks for the response I was getting pretty hopeless.
    So more ion concentration would equate to better conductivity?

    So am I getting this right:

    More ion concentration = better conductivity = less resistance = more current?
    Reply With Quote  
     

  5. #4  
    Life-Size Nanoputian Flick Montana's Avatar
    Join Date
    Jul 2012
    Location
    Flatland
    Posts
    5,438
    Think of it more as a stronger electrolyte will be a better medium. You have to consider the acids in the fruit.

    Basically, the acid reacts with the metal cathode and anode. The electrons that travel through the solution in the fruit can be better carried by strong electrolyte solutions that completely dissociate into ions. It is the interaction of the electrons moving between the cathode and anode that creates the electrical current. The more efficiently the electrons are carried, the stronger the current.
    "Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us." -Calvin
    Reply With Quote  
     

  6. #5  
    Forum Professor Zwolver's Avatar
    Join Date
    May 2006
    Location
    Netherlands
    Posts
    1,676
    How many lemons would you need to produce lethal voltage and current?
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
    Reply With Quote  
     

  7. #6  
    Suspended
    Join Date
    Apr 2007
    Location
    Pennsylvania
    Posts
    8,795
    Quote Originally Posted by Zwolver View Post
    How many lemons would you need to produce lethal voltage and current?
    This is not an easy question to answer, since the body's resistance varies, and lethal shock current depends on the organ being affected.
    According to this site, a lemon produces .00027 watts at 0.9 volts.
    Lemon battery - Wikipedia, the free encyclopedia
    According to this site, currents between 100 and 200 mA are lethal.
    Electrical Safety: The Fatal Current
    According to this site, the human body's resistance is typically about 1875 ohms at about 100 volts.
    Electric shock - Wikipedia, the free encyclopedia

    Taking this information together we get
    Power (I^2*R) of a lethal shock is about (100/1000) amps*(100/1000) amps *1875 ohms = .01*1875 = 18.75 watts.
    18.75 watts/.00027 watts per lemon =69,444 lemons.
    Reply With Quote  
     

  8. #7  
    Life-Size Nanoputian Flick Montana's Avatar
    Join Date
    Jul 2012
    Location
    Flatland
    Posts
    5,438
    Death by 70,000 lemons. Now THERE'S a science project!
    "Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us." -Calvin
    Reply With Quote  
     

  9. #8  
    Forum Professor Zwolver's Avatar
    Join Date
    May 2006
    Location
    Netherlands
    Posts
    1,676
    Quote Originally Posted by Flick Montana View Post
    Death by 70,000 lemons. Now THERE'S a science project!
    I'd say, dropping them on someone would cause death much easier and quicker. Or juice them, and make someone drown in them. Or make someone eat 50 lemons, that would be a cause of death probably..

    Hehe, still good to know.. So with enough time, and lemons, you can make lemonade..

    I don't know if it's illegal to touch someone with lemons... is it?
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
    Reply With Quote  
     

Similar Threads

  1. Does religion affect Happiness
    By ldzman218uknome in forum Behavior and Psychology
    Replies: 9
    Last Post: June 21st, 2010, 01:08 AM
  2. Electrolyte for Boron,Silicon?
    By Stanley514 in forum Physics
    Replies: 1
    Last Post: June 3rd, 2009, 11:59 AM
  3. Why Does Music Affect Us?
    By BioHazard in forum Biology
    Replies: 2
    Last Post: June 5th, 2007, 12:04 PM
  4. Electrolyte in ether
    By science in forum Chemistry
    Replies: 0
    Last Post: October 10th, 2005, 12:11 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •