Analytical ChemistryHard
Question
The presence of magnesium is confirmed in the qualitative analysis by :
Options
A.titan yellow solution + 2M NaOH solution
B.disodium hydrogen phosphate + NH4Cl + NH3 (aq.)
C.magneson(I) reagent
D.all of these
Solution
(A) titan yellow is absorbed by magnesium hydroxide producing a deep-red colour or precipitate.
(B) Mg2+ + NH3 + HPO42- → Mg(NH4)PO4 ↓ (white).
(C) Blue lake is formed by the adsorption of reagent on Mg(OH)2.
(B) Mg2+ + NH3 + HPO42- → Mg(NH4)PO4 ↓ (white).
(C) Blue lake is formed by the adsorption of reagent on Mg(OH)2.
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