tag:blogger.com,1999:blog-5376628436133716219.post1207539009903538419..comments2024-03-29T02:14:39.189-07:00Comments on Why I hate physics: How does a Lemon Battery work?Marty Greenhttp://www.blogger.com/profile/17624084719249673373noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-5376628436133716219.post-89711334961312271202018-05-24T13:20:27.999-07:002018-05-24T13:20:27.999-07:00ZnCl2 is highly soluble in aqueous solution, this ...ZnCl2 is highly soluble in aqueous solution, this solid would not form in solution.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5376628436133716219.post-48026817952043279232016-10-24T02:43:20.544-07:002016-10-24T02:43:20.544-07:00Interesting discussion. I don't see how it...Interesting discussion. I don't see how it's possible that sodium ions would steal electrons from zinc metal. If that were the case, wouldn't you get a vigorous chemical reaction (i.e. explosion) when zinc metal is added to salt water? <br /><br />The only answer I can come up with is the following: <br />On the outside of the copper electrode, there is a thin coating of copper oxide. When the copper electrode is immersed in liquid (saltwater or acid), a small amount of the oxidized copper dissolves and this accepts the electrons from the wire to become copper metal (which gets deposited on the copper electrode). <br /><br />I could be wrong, though. David Woosterhttps://www.blogger.com/profile/07597589072759954257noreply@blogger.comtag:blogger.com,1999:blog-5376628436133716219.post-80171837993319118602015-03-24T18:54:57.138-07:002015-03-24T18:54:57.138-07:00Thanks this article helped me with my 10th grade s...Thanks this article helped me with my 10th grade science fare project<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5376628436133716219.post-76167798997418458152014-04-01T09:53:21.445-07:002014-04-01T09:53:21.445-07:00Interesting theory. You posted this two weeks ago ...Interesting theory. You posted this two weeks ago but I only just noticed it. I looked up the enthalpies of formation of salt and zinc chloride, and it seems to be thermodaynamically unfavorable. However, if you allow the sodium metal to react with water, releasing hydrogen gas, it gets quite a lot better. But the change in enthalpy is still positive.<br /><br />But it's close. And I didn't calculate the entropies. So maybe that's it.<br /><br />For the record, my overall reaction is then:<br /><br />2NaCl + Zn + 2H20 <br /> --> ZnCl2 + 2NaOH + H2<br /><br />with enthalpy changes:<br /><br />-822 + 0 - 572 --> -415 - 852 + 0<br /><br />for a net positive enthalpy of 127 kJ.<br /><br /><br /><br />Marty Greenhttps://www.blogger.com/profile/17624084719249673373noreply@blogger.comtag:blogger.com,1999:blog-5376628436133716219.post-84113977426514162492014-03-17T06:54:31.369-07:002014-03-17T06:54:31.369-07:00The zinc anode is oxidized forming zinc ions. The...The zinc anode is oxidized forming zinc ions. The zinc ions react with chloride ions making ZnCl2. At the copper cathode sodium ions reduced making Na metal.<br /><br />2NaCl + Zn --> ZnCl2 + 2NaAnonymousnoreply@blogger.com