and after a series of dilutions the Experiment 39 Prelaboratory Date Lab Sec. 1.
ID: 592356 • Letter: A
Question
and after a series of dilutions the Experiment 39 Prelaboratory Date Lab Sec. 1. Identify the reagent (and its concentration) that is unedo untm the pera Desk No. a. Ni m the presence of each of the fohowing 2. Confirmatory tests for each of the following ions: the various ions conpoundion and the coloe fon are often colorful. Identify the confirmatory Confirmatory Compou nd/lon Color Fe'+ Rosr k Al+ 3. Identify the reagent that separates a. Fe from Zn2". Explain the chemistry of the separation. b. Fe from Ni+. Explain the chemistry of the separation. c. Al+ from Zn2. Explain the chemistry of the separation.Explanation / Answer
Q1
reagent which will identify the ions:
a)
Ni2+ will form a red-colored preicpitate when we add dimethylglyoxime , DMG
note that this mus be in basic solution
Ni+2 + 2 HDMG --> Ni(DMG)2 + 2 HNO3
b)
Fe+3 will form a complex of red-brown color, Fe(SCN)+2
then, add
Fe+3 + NaSCN(aq) = Fe(SCN)+2(aq)(red) + Na+
c)
Zn2+ ion precipitate with S2- ions therefore
Zn2+(aq) + S-2(aq) = ZnS(s)
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