You are given six numbered test tubes, #1 - #6. The test tubes contain 0.1 M sol

Question

You are given six numbered test tubes, #1 - #6. The test tubes contain 0.1 M solutions of the following compounds: AI(NO_3)_3 Ca(NO_3)_2 AgNCO_3 CuSO_4 Ba(NO_3)_2 Zn(NO_3)_2 You test each of the unknowns with each of the following reagents: 6 M NaOH 6 M H_2SO_4 6 M HCI 6 M NH_4OH each trial, you take 5 drops of unknown and 2 drops of the reagent and mix them in a well plate. The data from your tests is recorded in the two tables below. Select the identity of the unknown solutions from the drop-down menus below each table.

Explanation / Answer

Unknown 1 does not react with H2SO4 , but form white precipitate with both NaOH and NH4OH and HCL. The compound is Al(NO3)2. Reactions are as follows:

Al(NO3)2 + NaOH ------> Al(OH)3

Al(NO3)2 + HCl ------> AlCl2

Al(NO3)2 + NH4OH ------> Al(OH)3

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unknown 2 is Ca(NO3)2 which forms soluble Ca(OH)2 precipiate with both NaOH and NH4OH.

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Unknown 3 : Cu(NO3)2

It reacts with HCl to form CuCl2 which is bluish green

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unknown 4 : Ba(NO3)2

It forms a white precipitate of BaSO4 with H2SO4.

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unknown 5 : Zn(NO3)2

Zn (No3)2 + NaOH ----> Zn(OH)2 (precipiate) -----> NaZnO2 (precipitate dissolves)

unknwon 6 : AgNO3

white precipiate with HCl.

AgNO3 + HCl ----> AgCl (white precipiate)

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