Making of iron(II) hydroxide, 1 of 6. Iron(II) hydroxide precipitate (Fe(OH)2) is formed by adding 1M solution of sodium hydroxide (NaOH) to 0.2M solution of iron(II) sulphate (FeSO4), Photos 1-3. The reaction is FeSO4 + NaOH -> Fe(OH)2 + Na2SO4. Pure iron(II) hydroxide is white, however even trace amounts of oxygen make it greenish. The Fe(OH)2 precipitate is filtered out of the solution through a funnel with a paper filter, Photo 4. The damp dark-green filtrate is placed on a watch glass, Photo 5. After Fe(OH)2 is left to dry for several hours, it oxidizes to iron(III) hydroxide (Fe(OH)3) due to exposure to air, Photo 6. | |
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Credit: | Science Photo Library / Science Source / Turtle Rock Scientific |
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