ChemLab113-0066 - EXPERIMENT 6 Synthesis afar Iron Compound...

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Unformatted text preview: EXPERIMENT 6 Synthesis afar: Iron Compound Introduction The morganic compound you will synthesize this week 15 an example of an important class of substances called metal-ion coordination comp_ounds. Any compound in that class contains metal cations that fimction as electron-pair acceptors in coordinate covalent bonds with electron— donor species. The compound you will synthesize contains Fe3+ ions (caziled iron (Ill) ions or ferric ions), and each 1ron (III) ion is bonded to three oxalate 10115 (C2042 ') through coordinate covalent bonds with two oxygen atoms in each oxalate ion. The following chemical equation shows the bonding that occurs when an iron (IE!) 1on combines with one of the three oxalate ions. .0 6'. 2- O 6: 1+ \l I; \l ’1 Fe“ + ,c— q "—r' ,C "C. : g: :9 : 2 Oi ’30: Fe The equation shows that each bond between the iron (111) ion and the oxalate ion is a coordinate covalent bond involving an electron pair supplied by an oxygen atom. Each of the three oxalate ions bonded to every iron (I11) 1on in the compound you will synthesize 1s bonded' 1n the fashion shown. The formula of the species containing an iron (III) 1011 bonded m that way is F C(C204ls - It is formed by mixing an aqueous solution containing iron (111) 10115 with an aqueous solution containing oxalate ions, as shown by the following equation. Fe“ (aq) + 3 0203' (aq) —> moot)? (aq) In the synthesis you will carry out, the iron (III) ions will be present in a solution of iron (III) chloride (FeClg), and the oxalate ions will be contained in a solution of potassium oxalate (KZC204). Fe(C204)33' ions (called his-oxalatoferrate (III) ions) are formed immediately upon mixing the iron ([11) chloride solution with a hot potassium oxalate solutiOn. Upon cooling in an ice-water mixture, large, green crystals of a compound with the formula K3[Fe(C204)3]-3H20 rapidly form in the solution. That compound, called potassium tris—oxalatoferrate (III) nihydrate, contains K+ ions, Fe(C204)33' ions and water molecules. The synthesis of that compound in high yield and purity is the aim in this experiment. The following equation shows the reaction that is the basis for the synthesis. 3 K2c204 (aq) + FeCl; (aq) + 3 H20 (1) —> K3[Fe(C204)3]-3 H20 (3) + 3 KCi (aq) The synthesized product will be purified using a technique called recrystallization. Recrystallization is used by chemists to purify solids that are contaminated with small amounts of other substances that cannot be removed simply by heating in an even as, for instance, water can be removed. In this experiment the crystals of K3[Fe(C204)3]-3H20 are contaminated with 93 ...
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