Complete the following sentences: a. Mercury(I) Iodide is more soluble than/less
ID: 967875 • Letter: C
Question
Complete the following sentences: a. Mercury(I) Iodide is more soluble than/less soluble than/equal insolubility to mercury (I) chloride. b. The Ksp for lead(II) chloride dissolved in water is greater than/less than/equal to the Ksp for lead(II) chloride dissolved in an aqueous solution of sodium chloride. c. The molar solubility for lead(II) chloride dissolved in water is greater than/less than equal to the molar solubility for lead(II) chloride dissolved in an aqueous solution of sodium chloride.Explanation / Answer
a. Large size of iodide anion makes it easily polarisable and hence degree of covalency is more in iodide salts than in respective chloride salts. So, iodide salts will be less soluble in water than respective chloride salts.
Mercury (I) Iodide is less soluble than mercury (I) chloride (in water).
b. Solubility product, Ksp of a salt is the product of molar concentrations of constituent ions raised to appropriate powers, in a saturated solution of salt at given temperature. It is a constant at a given temperature and does not depend on the concentration of the ions in the solution. If in a solution concentration of any one constituent ion is far exceeded then concentration of the other constituent ion decreases and vice versa so that product of their molar concentrations remains constant and equal to Ksp.
So, answer for question b. is, Ksp for lead(II) chloride dissolved in water is equal to Ksp for lead(II) chloride
dissolved in aqueous solution of sodium chloride.
c. In any solution [Pb2+][Cl-]2 cannot exceed solubility product constant Ksp of PbCl2 at given temperature. If [Cl-] far increases then [Pb2+] decreases and vice versa such that [Pb2+][Cl-]2 does not exceed Ksp.
Aqueous solution of sodium chloride already contains Cl- ions. Since [Cl-] is more, [Pb2+] possible in the solution is lesser or in other words molar solubility of PbCl2 is lesser in aqueous solution of sodium chloride than in water.
Answer for question c is, molar solubility for lead(II) chloride dissolved in water is greater than molar solubility for lead(II) chloride dissolved in aqueous solution of sodium chloride.