Date: Tue, 4 Feb 1997 22:27:04 -0800
To: pinhole@exploratorium.edu
From: dgray@justin-siena.napanet.net (Dan Gray)
Subject: Re: Volcanoes
Message-Id: <1DF3790581@justin-siena.napanet.net>
>Hi Pinholers,
>You can make a neat volcano by igniting ammonium dichromate
>(NH4Cr2O7). The orange crystals turn into green mountain of chromium oxide.
>Do this demo in a fume hood, because the oxide is toxic. The gas emmitted
>during the reaction is nitrogen (harmless).
>You can make a whizz-bang geyser by putting 50 ml of water and 50 ml of 30%
>peroxide solution in a 2 liter plastic bottle. Add about 5 grams of manganese
>dioxide and stand back! The geyser is just steam.
>
>
> Good
>Luck, Neil Fetter
I've done something similar to this geyser idea, I used KI instead of MnO2,
and if you put in a squirt of dish soap before you add the catalyst it
erupts in mountains of foam.
I also add a little blue or red food coloring as well.
Remember, be extremely careful with the hydrogen peroxide!!!
Dan Gray
dgray@justin-siena.napanet.net