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Thiocyanate complex formation, 3 of 4

Thiocyanate complex formation, 3 of 4

C030/8215

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Credit

GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY

Caption

Thiocyanate complex formation, 3 of 4. M solution of iron(III) chloride is added drop by drop to a test tube with 0.5 M solution of potassium thiocyanate (KSCN). Iron chloride solution has a yellow colour due to formation of hexaaquairon(III) complex ion ((Fe(H2O)6)3+). When potassium thiocyanate (KSCN) is added, iron(III) ion (Fe3+) complexes with thiocyanate ion ((SCN)-), producing thiocyanatoiron(III) complex ion ((Fe(SCN))2+) that gives the solution its blood red colour. This reaction can be used as a test for Fe3+ ions in a solution.

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