Voltametre troubles
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- Posts: 19
- Joined: 04 Feb 2013, 13:28
- Job Title: Lab tech
- School: Emanuel School
- Suburb: Randwick
- State/Location: NSW
Voltametre troubles
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!
- Lyn
- Posts: 709
- Joined: 16 May 2006, 10:00
- Job Title: Lab Assistant (Technician)
- School: St. John's Catholic College
- Suburb: Darwin
- State/Location: NT
Re: Voltametre troubles
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.
Lyn.
- Labbie
- Posts: 3259
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Voltametre troubles
We use 2M Sulfuric Acid
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Re: Voltametre troubles
We use 2M Sulfuric as well.
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- Posts: 174
- Joined: 29 Oct 2008, 12:34
- School: Central Coast Grammar School
- Suburb: Erina Heights
- State/Location: NSW
Re: Voltametre troubles
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!
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- Posts: 19
- Joined: 04 Feb 2013, 13:28
- Job Title: Lab tech
- School: Emanuel School
- Suburb: Randwick
- State/Location: NSW
Re: Voltametre troubles
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!
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- Posts: 19
- Joined: 04 Feb 2013, 13:28
- Job Title: Lab tech
- School: Emanuel School
- Suburb: Randwick
- State/Location: NSW
Re: Voltametre troubles
Hurrah. After 5 goes I have heard the magic pop!