Re: pinhole Limiting Reactant Demo

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Fri Jan 10 2003 - 08:00:36 PST 

Message-Id: <l0311070aba449e5b5e80@[192.174.3.125]>
Date: Fri, 10 Jan 2003 08:00:36 -0800
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole Limiting Reactant Demo

Hi Raleigh

Here's a clue.

Balloon rubber is permeable to CO2.

Paul D

>It's a pretty common experiment to put baking soda in
>a balloon and an acid, usually vinegar in elementary
>school, in a plastic soda bottle. We've all seen how
>the balloon filled with Carbon dioxide seems to
>deflate over time much faster than a balloon filled
>with air too.
>Accidently lost track of one of these experiments as
>it fell behind a box and was surprised to find, after
>about a week that the balloon had been pulled into the
>plastic bottle and the bottle had crushed flat (no,
>the box did not fall on the bottle!). The crushing of
>the plastic container isn't gonna happen if you use a
>glass flask to do this. It was really odd as I
>couldn't figure out why the balloon and bottle would
>crush. Talked to "It's more complicated than that" and
>he set me off on a quest to figure it out...guided
>inquiry or something I guess. It always amazes me to
>see it and I leave at least one of my experiments out
>until it pulls the balloon into the bottle to vex and
>concern my students.
>
>With firm handshake,
>Raleigh
>
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