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Atomistry » Potassium » Chemical Properties » Potassium pyrosulphite | ||
Atomistry » Potassium » Chemical Properties » Potassium pyrosulphite » |
Potassium pyrosulphite, K2S>2O5
On treatment of a hot saturated solution of potassium carbonate with sulphur dioxide, the Potassium pyrosulphite, K2S2O5, separates in monoclinic crystals, which are more stable than those of the primary sulphite. Its heat of formation from the elements is 369.4 Cal. It is employed in the preparation of photographic developers under the name " potassium metabisulphite."
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