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10484608How do I solve question number 3 and 4?

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PROP0375: Separating the Components of a Ternary Mixture
(3) Could you separate the components of a mixture of benzoic acid, Mg(OH)2, and NazSO, by
using only cold water and 3M HCI? Briefly explain your answer.
(4) A mixture was known to contain three of the four compounds in the table. After the mixture
of the three solids was extracted with hot water and filtered, Compound A was obtained by
evaporating the filtrate to dryness.
When 3M HCI was added to the solid residue, a clear solution resulted. After adding excess
3M NaOH solution to the acid solution, a precipitate formed. After filtration, the insoluble solid
was found to be Compound B. Compound C was recovered by evaporation of the filtrate. Neither
Compound A, B, nor C was soluble in all of the solvents, that is water, 3M HCI, and 3M NaOH.
Identify Compounds A, B, and C. Briefly explain your answer.

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