Question

Which of the following is an example of insoluble salt:
A: Lead carbonate
B: lead sulphate
C: Lead chloride
D: All of the above

Answer 1

Hint: Insoluble salts are those ionic compounds that are not able to dissolve in water but form a suspension, i.e., the salt continues to exist as a solid rather than dissolving in liquid. As polar and nonpolar substances are insoluble when mixed with each other.
For example - All carbonates, hydroxides and oxides are insoluble with the exception of sodium, potassium and ammonium salts.

Complete step by step answer:
In general, most of the salts formed from alkali metals are soluble in water. Most salts formed with chlorides, bromides and iodides are soluble, but salts formed with carbonates, sulfides and oxides are insoluble.
The general rules for predicting the solubility of salts in water:

recall the general rules for predicting the solubility of salts in water:

i .all common Sodium, Potassium and Ammonium salts are soluble
ii. all Nitrates are soluble
iii. common Chlorides are soluble, except Silver Chloride
iv. common Sulphates are soluble, except those of Barium and Calcium
v. common Carbonates are insoluble, except those of Sodium, Potassium and Ammonium
Therefore the answer is all of the above.
Lead sulfate, barium sulfate, Silver chloride, silver bromide, silver iodide, lead chloride, lead bromide, lead iodide, most carbonates different than sodium and potassium, most hydroxides different than sodium and potassium are insoluble in water.

So, the correct answer is Option D .

Additional Information:
You can just use dilute hydrochloric acid and silver nitrate solution to make insoluble silver chloride by precipitation. The silver nitrate provides the silver ion and the hydrochloric acid provides the chloride ion to prepare the insoluble salt silver chloride which forms as a white precipitate.



Note:
In practice, many salts that are described as insoluble do actually ionize slightly in water, releasing ions into solution.
The undissolved solid in contact with water will come into equilibrium with the ions it has released. At this point the solution is said to be saturated.