MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Sulphate solutions. Bottles containing different sulphate (vitriol) solutions. The solutions seen here are (from left to right): zinc sulphate, iron sulphate, copper sulphate and magnesium sulphate. Sulphates are a group of salts which are generally formed by the reaction between a metal or alkali with sulphuric acid.
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