B is the correct answer, but you have to understand them. Which of the following is insoluble in water? Na2S PbSO4 KNO3 MgCl2
Concepts and reason
The concept used in this problem is based on the solubility rule. The solubility rule defines which compound is soluble in water and also determines the degree of solubility of any salt.
First, compare the solubility of each ion of the salt in water and in the next step check each of the given compounds using the solubility ruler.
When a salt is dissolved in water, whether it is soluble or not, can be determined using the solubility rule.
The next point is under the solubility rule:
1. Salts with group I and group II elements are soluble in water. Ammonium salts are also soluble in water.
2. Containing salts are generally soluble in water. But with the exception of salts of lead, mercury and silver.
3. Most silver salts are insoluble in water, like .
4. Most sulphate salts are soluble in water, except .
5. The carbonates of the group II elements are mainly insoluble in water.
The solubility of salt can also be estimated by the value of its solubility product, the greater the value of the solubility product, the greater the solubility.
Step by step
Step 1 of 2
(A) The dissociation of is as follows.
(C) The dissociation of is as follows.
(D) The dissociation of is as follows.
According to the solubility rule, salts of groups I and II are soluble in water. Here, sodium and potassium belong to group I and magnesium belongs to group II. They are therefore soluble in water.
The salts of the elements of the first group and the second group are soluble in water, make no mistake about it.
Use the same solubility rule to find which compound is soluble in water.
Step 2 of 2
(B) The dissociation of is shown below.
it is insoluble in water.
According to the solubility rule, salts of lead sulfate are insoluble in water and those containing sulfate ions are insoluble in water.
The solubility constant () values for this salt are also smaller. It is therefore insoluble in water.
The sulfates of all elements are soluble, but lead barium sulfate is insoluble in water.
it is insoluble in water.
it is insoluble in water.
MgCl2 Mg2 +2Cl
PbSO4(s)Pb2(aq)+SO42(aq) (K 6.3×107 = sp
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