Podophyllin is a resinous powder obtained by precipitating an alcoholic tincture of the rhizome by means of water acidulated with hydrochloric acid.
If we connect together in series a single Daniell's cell, a galvanometer, and two platinum electrodes dipping into acidulated water, no visible chemical decomposition ensues.
A current will flow for a while in the reverse direction; the system of plates and acidulated water through which a current has been passed, acts as an accumulator, and will itself yield a current in return.
When we use platinum electrodes in acidulated water, hydrogen and oxygen are evolved.
The beaker also is cautiously filled with acidulated water up to a point beyond the edge of the platinum basin.
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