DATA AND QUESTIONS Record your observations of solid cusoa 5H.o Record your obse
ID: 523311 • Letter: D
Question
DATA AND QUESTIONS Record your observations of solid cusoa 5H.o Record your observations of solid CuClz 2Hzo bright blue neon olue Record your observations of aqueous cuso. solution -venu faint blue ost green-blue Use the table below to record your observations of the addition of each reagent to a solution of aqueous copper(II) and write a formula for the complex ion formed in each case. TUBE H REAGENT ADDED OBSERVATIONS COMPLEXION FORMED deep dork blue 15 M NH3 anbund test tube NH2CH2CH2NH2 Color turnd 12 M HCI 6 M NaOH non green NaNO2 dark Hint: Potassiam ion gets replaced with an Cross octahedral complex involving copper 0.10 M K4[Fe(CN)6] Drown r and water ligands.Explanation / Answer
Solution:
Note: The simplest ion that copper forms in solution is the typical blue hexaaquacopper(II) ion - [Cu(H2O)6]2+. This complex ions react with the various reagents in aqueous solution.
Ans to Question related to Tube 1: Formula of the complex ion formed is
( tetraamminediaquacopper(II) ions) [Cu(NH3)4(H2O)2]2+
Cu((H2O)6]2+ + 4NH3 [Cu(NH3)4(H2O)2]2+ + 2 H2O
Ans to Question related to Tube 2 : Formula of the complex ion formed is [Cu(NH2CH2CH2NH2)2(H2O)2]
Ans to Question related to Tube 3: If you add concentrated hydrochloric acid to a solution containing hexaaquacopper(II) ions ) [Cu((H2O)6]2+, the six water molecules are replaced by four chloride ions )
[Cu((H2O)6]2+ + 4Cl- [CuCl4]2- + 6H2O
The formula of the complex is [CuCl4]2-
Ans to Question related to Tube 4: The simplest ion that copper forms in solution is the typical blue hexaaquacopper(II) ion - [Cu(H2O)6]2+.
Hydroxide ions say, sodium hydroxide solution remove hydrogen ions from the water ligands attached to the copper ion.
[Cu((H2O)6]2+ + 2OH- [Cu(H2O)4(OH)2] + 2 H2O
The formula of the complex is [Cu(H2O)4(OH)2]
Ans to Question related to Tube 5:
Cu(II) + NaNO2 = Cu(NO2)2
The formula of the complex is Cu(NO2)2
Ans to Question related to Tube 6:
K4[Fe(CN)6] + 2CuSO4 Cu2[Fe(CN)6] + 2K2SO4
The formula of the complex is Cu2[Fe(CN)6]
The complex ion that is formed with 1,10-phenanthroline with FeSO4.5H2O is Fe(phen)32+
Fe2+ + 1,10-phenanthroline Fe(1,10-phenanthroline)3 (red colored complex)
Ans to Question related to Tube A: On addition of a solution of KSCN to s solution of Fe(III) Blood red colored iron (III) thiocyanate complex ion is produced. Formula of the complex is Fe(SCN)2+
Fe 3+ (aq) + SCN- (aq) <=> Fe(SCN)2+ (aq)
Ans to Question related to Tube A: On addition of a solution of K4[Fe(CN)6] to s solution of Fe(III) deep blue (Prussian blue) color is formed because of the formation of the complex Fe4[Fe(CN)6]3 Formula of the complex is Fe4[Fe(CN)6]3
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