Which of the following compounds is insoluble in water?


Which of the following compounds is insoluble in w

Answer

General guidance

Concepts and reason

The concept used in this problem isbased on the solubility rule. The solubility rule defines which compound is soluble in water and also determines the extent of the solubility of any salt.

First, compare the solubility of each ion of the salt in water and in the next step check for each of the given compounds with the help of solubility rule.

Fundamentals

Solubility rule:

When any salt dissolved in water,whether it is soluble or not can be determined using the solubility rule.

The following point comes under solubility rule:

1.The salts having group I elements are soluble in water. Ammonium salts are also soluble in water.

2.Salts containing [CIJ[BrJTare usually soluble in water. But except lead, mercury and silver salts.

3. Most of the silver salts are insoluble in water such as AgCl, PbCl
2.

4. Most of the sulfate salts are soluble in water except BaSO4, PbSOetc.

5. Carbonates of group II elements are mostly insoluble in water.

The solubility of the salt can also be estimated by the value of their solubility product as higher the value of solubility product, more will be the solubility.

Step-by-step

Step 1 of 2

(1)

Dissociation of PbSO4is shown below.

PbSO4(s)Pb2 (aq)+SO22(aq)
(K 6.3x107
sp

Dissociation ofAgClis shown below.

AgCl(s)Ag(aq)+Cl(aq)
(K p 1.8x1010

Dissociation of CaCOis shown below.

CaCO,(s)Ca2 +CO,2
(K3.36x10)
3
sp

PbSO
4,AgCl,СаСО, are insoluble in water.

Therefore, all of the above are insoluble in water.


According to the solubility rule, the sulfate salts of lead are insoluble in water and hence PbSO4which has sulfate ion is insoluble in water.

The halide salts of silver are also insoluble in water. This is an exception as halide salt of most of the metal are soluble in water.

Carbonates of group II elements are insoluble in water. Calcium is an element of group II of the periodic table.

The solubility constant () values for these salts are also less. Hence they all are insoluble in water.

Step 2 of 2

(2)

Dissociation ofBaSOis as follows.

BaSO4(s)Ba2* +SO22
(K1.08x100)
sp

Dissociation ofРЬСІ, is as follows.

PbCl,(s)Pb2* +2Cl
(K1.62x10
sp

Dissociation ofNa2CO
3. is as follows.

Na CO,(s)2Na* +CO3
2-
(Ksp 1.2)

Dissociation ofAgCl is as follows.

AgCl(s)Ag +Cl
(K18x101)
sp

Sodium carbonate (Na,CO
3) is soluble in water.


According to the solubility rule, the sulfate salt of lead and barium are insoluble in water and hence which has sulfate ion is insoluble in water.

The halide salts of silver and lead are also insoluble in water. This is an exception as halide salt of most of the metal are soluble in water. Therefore, РЬСІ,and AgClare insoluble in water.

Carbonates of group I elements are soluble in water. Sodium is an element of group I of the periodic table.

The solubility constant (Ksp) value is less for,РЬСІ,andAgCl. Hence they all are insoluble in water. But the solubility constant value for sodium carbonate is much greater and hence it is soluble in water.

Answer

PbSO
4,AgCl,СаСО, are insoluble in water.

Therefore, all of the above are insoluble in water.

Sodium carbonate (Na,CO
3) is soluble in water.


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