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Voltametre troubles
Posted: 13 Feb 2014, 14:36
by sarahj
I know this probably seems like a really silly question but when I use my voltameter I cant seem to collect enough hydrogen to make a "pop". As you can understand the students are very disappointed :( Am I doing something really stupid? The hoffmans voltameter is literally brand new!
Re: Voltametre troubles
Posted: 13 Feb 2014, 15:22
by Lyn
What strength H2SO4 are you using? We have used 1M and then added a few drops of Conc. H2SO4 just to give it a bit of a zing. Or you could try a slightly stronger solution. The kids are never told that there is anything other than water in the voltameter. As long as you get the right result and the right noisy pop to keep them happy.
Lyn.
Re: Voltametre troubles
Posted: 13 Feb 2014, 16:15
by Labbie
We use 2M Sulfuric Acid
Re: Voltametre troubles
Posted: 14 Feb 2014, 08:38
by dime
We use 2M Sulfuric as well.
Re: Voltametre troubles
Posted: 14 Feb 2014, 10:31
by MariaC
We use a squirt ( very scientific) of 6M, but add it to the distilled water and stir BEFORE you add to voltameter! I was adding it to the receptacle area, and it wasn't producing any bubbles, but if mixed thoroughly in the water no problems!
Re: Voltametre troubles
Posted: 14 Feb 2014, 13:22
by sarahj
I am getting bubbles no problems with the 1M but im not getting the 'Pop' when I put the match over the hydrogen. Im so confused!
Re: Voltametre troubles
Posted: 14 Feb 2014, 14:11
by sarahj
Hurrah. After 5 goes I have heard the magic pop!