Discharged lead-acid batteries start with one plate covered in lead sulfate.
Charging creates sulfuric acid from the lead sulfate.
As discussed earlier, running a current through copper sulfate also produces sulfuric acid.
By induction, we might assume that many common sulfates could be used in this way to produce the acid. Sodium sulfate and ammonium sulfate are common fertilizers.
Boiling the dilute acid concentrates it.
Nathan may want to look here:
-----
Get a free science project every week! "http://scitoys.com/newsletter.html"On Fri, Nov 30, 2012 at 7:06 AM, Cathal Garvey <cathalgarvey@gmail.com> wrote:
Being honest, I haven't looked very hard for sulphuric acid, so you're
probably right! Although, battery supplies generally appear to be pretty
rare these days; even deionised water isn't so common anymore, as most
new batteries are sealed-gel rather than free liquid. Even if you wanted
to replace the battery acid, you couldn't.
Will keep an eye open for it though next time I'm in an auto store.
Would be handy to have a bit in the lab.
On 29/11/12 18:44, woodsjay@cox.net wrote:
> You should be able to get battery acid (even in Ireland - smile).
> ---- Cathal Garvey <cathalgarvey@gmail.com> wrote:
>> It's not always available: I have yet to find sulphuric acid available
>> for sale around Ireland, although HCl is available as 10M solution in
>> hardware stores.
>>
>> That said, electrolysing etc. to make hard Sulphuric acid might be a
>> waste of effort if all you need is a strong mineral acid: use HCl
>> instead. But if it's gotta be sulphuric, it might not be available locally..
>>
>> On 28/11/12 06:13, Eugen Leitl wrote:
>>> On Tue, Nov 27, 2012 at 06:46:39PM -0500, Dakota wrote:
>>>> Making sulfuric acid on the cheap from copper sulfate found as root killer
>>>
>>> Sulfuric acid is probably the cheapest chemical around.
>>> There's no point in synthesizing everything from
>>> scratch, just buy it.
>>>
>>>> at hardware stores is pretty easy, and also involves simple electrolysis
>>>> and pretty colors.
>>>>
>>>> http://www.youtube.com/watch?v=5dUSF9Gl0xE
>>>>
>>>> There are also a few ways to make HCl,
>>>> http://www.youtube.com/watch?v=YGjd7xxTuZw&feature=relmfu
>>>>
>>>> and nurdrage has more videos on nitric acid.
>>>>
>>>> You can also get cheap sulfuric acid and hydrochloric acid (although I
>>>> don't think concentrated) at hardware stores again, used for stone masonry.
>>>
>>> A local artist/pigment shop sells hundreds of chemicals, and
>>> very cheap, too.
>>>
>>
>> --
>> www.indiebiotech.com
>> twitter.com/onetruecathal
>> joindiaspora.com/u/cathalgarvey
>> PGP Public Key: http://bit.ly/CathalGKey
>>
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