ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Precipitation reaction. Iron (II) hydroxide (green) being precipitated from a solution by the addition of sodium hydroxide from a dropper (top). Precipitation occurs when an insoluble salt is formed by a reaction. In this case, a solution of iron (II) sulphate (FeSO4, yellow) reacts with the sodium hydroxide (NaOH) to form insoluble iron (II) hydroxide (Fe(OH)2) and soluble sodium sulphate (Na2SO4).
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