Re: pinhole barium hydroxide?

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From: Geoff Ruth (gruth@leadershiphigh.org)
Date: Fri Apr 22 2005 - 07:07:35 PDT 

Message-Id: <p06110408be8eb46379f2@[192.168.1.149]>
Date: Fri, 22 Apr 2005 07:07:35 -0700
From: Geoff Ruth <gruth@leadershiphigh.org>
Subject: Re: pinhole barium hydroxide?

Charlotte --

I have some barium hydroxide that you can borrow. My school is near
BART, so it would be relatively easy for you to come by here if you
want to take BART.

Dissolving ammonium nitrate or ammonium chloride in water is
endothermic process, although not as spectacularly endothermic as the
barium hydroxide and ammonium chloride rxn.

Be aware that the Ba rxn creates a solution of barium chloride, which
you shouldn't just throw down the drain, since Ba is moderately toxic.

Here's the description of another, safer, endothermic rxn involving
citric acid and baking soda:
http://chemistry.about.com/cs/howtos/ht/endothermic.htm
I haven't tried this, so I'm not sure how much the temperature will
drop. You could figure out by calculating the enthalpy change for the
reaction, and then using the specific heat of water to find how much
this energy change should drop the water's temp.

Hope this helps,
Geoff

>Hi all,
>
>I just learned about the endothermic reaction between barium
>hydroxide and ammonium chloride, and really want to do it on Tuesday.
> But, unfortunately, I don't have barium hydroxide and can't get it
>on time.
>
>Do you know of any other endothermic reactions I could do?
>
>OR Is there anyone who would be able to give me some barium hydroxide
>for now, and have it replaced next Friday (that's when the order
>would come in)?
>
>Thanks,
>Charlotte
>
>Science Teacher
>Summit Preparatory High School
>650-683-0460
>
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