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 HCl was added to the solid residue, a clear solution resulted.  After adding excess 3M NaOH solution to the acid solution, a precipitate was formed.  After filtration, the insoluble solid was found to be Compound B.  Compound C was recovered by evaporation of the filtrate.  None of the compounds (A, B, or C) was soluble in all of the solvents; water, 3M HCl, and 3M NaOH.   Identify Compounds A, B, and C.  Justify your answer.

Chemistry for Today: General, Organic, and Biochemistry
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Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
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Chapter9: Acids, Bases, And Salts
Section: Chapter Questions
Problem 9.15E: The following reactions illustrate Brnsted acid-base behavior. Complete each equation....
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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 HCl was added to the solid residue, a clear solution resulted.  After adding excess 3M NaOH solution to the acid solution, a precipitate was formed.  After filtration, the insoluble solid was found to be Compound B.  Compound C was recovered by evaporation of the filtrate.  None of the compounds (A, B, or C) was soluble in all of the solvents; water, 3M HCl, and 3M NaOH.  

Identify Compounds A, B, and C.  Justify your answer. 

Soluble in:
Cold
Hot
3M
3M
water
water
HCI
NaOH
Benzoic acid
Mg(OH)2
NazSO4
Zn(OH)2
No
Yes
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Yes
Yes
Yes
No
Transcribed Image Text:Soluble in: Cold Hot 3M 3M water water HCI NaOH Benzoic acid Mg(OH)2 NazSO4 Zn(OH)2 No Yes No Yes No No Yes No Yes Yes No Yes Yes Yes Yes No
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