Re: dead battery

Earlier in this thread, I took at face value the table in the CRC handbook
that said that MnO2 is soluble in HCl. However, last night I was looking
at "Laboratory experiments in general chemistry. Semimicromethod", MIR
publishers, Moscow, 1974, and their experiments for manganese and noticed
the following: "Experiment 5 [...] (a): Oxidizing properties of manganese
dioxide. Procedure. Place a micro-spatulaful of manganese dioxide into a
cylindrical test tube and add 2-3 drops of concentrated hydrochloric acid,
density 1.19 g/ml. Identify the gas that is evolved (by color and odor).
If the reaction is insufficiently intense, heat the test tube carefully
over a small flame. Write down the equation for the reaction."

I don't actually know what gas is evolved and I don't have a laboratory
in which to do the experiment. However, it is natural to guess that the
gas is chlorine, which is identifiable by its color. If so, it seems to
be inaccurate for the CRC handbook to say that MnO2 is soluble in HCl
when in fact it reacts with it.
--
Ignorantly,
Allan Adler <ara@xxxxxxxxxxxxxxxxxxxx>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.
.

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