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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: greg_888_V8 on May 11, 2009, 08:45:19 AM

Title: Electrochemical Cell self practical
Post by: greg_888_V8 on May 11, 2009, 08:45:19 AM
(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fwww.adam.com.au%2Fgregerson%2FChem.jpg&hash=928e7f5e28fe27e79118ef403cbea33f48bdf6de)

*delete me*
Title: Re: Electrochemical Cell self practical
Post by: ARGOS++ on May 11, 2009, 09:33:40 AM

Dear greg_888_V8;

Only a few hints:
Have you thought about that water is a bad conductor and so it’s quite difficult to increase the current for a higher gas generation rate!
Normally you add first some ions which will not influence the kind of electrolysis to increase the conductivity; and then you are able to increase the current and also the gas rate.

Possible "Ions" are H2SO4, or NaNO3, or etc.

It’s a little different if you electrolyse already a salt solution. Then already increasing the current will result in a higher gas rate.

Measure the gas rate by collecting it over a given time period. As one example:
          http://en.wikipedia.org/wiki/Hofmann_voltameter  

Good Luck!
                    ARGOS++
Title: Re: Electrochemical Cell self practical
Post by: ARGOS++ on May 11, 2009, 10:00:28 AM

Dear greg_888_V8;

You may also study:
           http://en.wikipedia.org/wiki/Electrolysis_of_water
           http://en.wikipedia.org/wiki/Electrolysis

Good Luck!
                    ARGOS++
Title: Re: Electrochemical Cell self practical
Post by: Borek on May 11, 2009, 11:48:53 AM
Greg, if you have a question - please WRITE it, don't post links to images.
Title: Re: Electrochemical Cell self practical
Post by: AhBeng on May 11, 2009, 02:09:40 PM
Quote from: Borek on May 11, 2009, 11:48:53 AM
Greg, if you have a question - please WRITE it, don't post links to images.

Most curious. Why would Greg go through the effort of making an image file of his question (the image url appears to indicate it's indeed owned by Gregerson), instead of typing out the question on the forum?

Furthermore, the question does not include any diagram or structural formula that would necessitate an image file. Perhaps the issue has to do with a foreign language?

Curious.
Title: Re: Electrochemical Cell self practical
Post by: greg_888_V8 on May 11, 2009, 06:13:34 PM
no i did an image, so the written information of the question im assigned wasnt exactly copied.

im curious how i would set up a practical. What materials do i need. How exactly is the rate of gas is given off, measured?
Title: Re: Electrochemical Cell self practical
Post by: Borek on May 12, 2009, 04:05:19 AM
Quote from: greg_888_V8 on May 11, 2009, 06:13:34 PM
no i did an image, so the written information of the question im assigned wasnt exactly copied.

So you are either asking question that you should not, or you are too lazy to explain the problem in your own words. As you may guess both approaches seem unacceptable.

Please don't do it again.