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I’ve been struggling for a while now. The solutions are mixed with 1M Na2SO4 1M

ID: 1037740 • Letter: I

Question

I’ve been struggling for a while now. The solutions are mixed with 1M Na2SO4 1M Na2CO3 6M NaOH 6M NH3 Table of Solubility Properties Ba2 Mg Cd2* NR |NR Na SO4 a4l Na CO NaOH NR NH3 No reaction. No precipitate or complex ion forms on mixing reagents. Formula of insoluble precipitate. Key: NR First line Second line Formula of complex ion that forms in excess reagent. Third line Formula of the cation formed if precipitate dissolved on addition of HNO3. Fourth line Formula of the precipitate formed on addition of Na CO.

Explanation / Answer

Ba2+

Mg2+

Cd2+

Al3+

Na2SO4

BaSO4

NR

NR

NR

BaCO3

MgCO3

CdCO3

Al2(CO3)3

Na2CO3

BaCO3

MgCO3

CdCO3

Al2(CO3)3

Mg2+

Cd2+

BaCO3

MgCO3

CdCO3

Al2(CO3)3

NaOH

NR

NR

Cd(OH)2

Al(OH)3

Al(OH)4-

Cd2+

Al3+

BaCO3

MgCO3

CdCO3

Al2(CO3)3

NH3*

NR

NR

NR

Al(OH)3

Al(OH)4-

Al3+

BaCO3

MgCO3

CdCO3

Al2(CO3)3

*We have considered an aqueous solution (contains water also) and Al3+ reacts with aqueous ammonia to give Al(OH)3.

Ba2+

Mg2+

Cd2+

Al3+

Na2SO4

BaSO4

NR

NR

NR

BaCO3

MgCO3

CdCO3

Al2(CO3)3

Na2CO3

BaCO3

MgCO3

CdCO3

Al2(CO3)3

Mg2+

Cd2+

BaCO3

MgCO3

CdCO3

Al2(CO3)3

NaOH

NR

NR

Cd(OH)2

Al(OH)3

Al(OH)4-

Cd2+

Al3+

BaCO3

MgCO3

CdCO3

Al2(CO3)3

NH3*

NR

NR

NR

Al(OH)3

Al(OH)4-

Al3+

BaCO3

MgCO3

CdCO3

Al2(CO3)3