Question

The addition of which substance will decrease the solubility of AgNO3 in water?

Answer 1

Answer: The correct answer is Option 3.

Explanation:

Common ion effect is defined as the effect which occurs on equilibrium when a common ion (an ion which is already present in the solution) is added to a solution. This effect decreases the solubility of a solute.

In silver nitrate, the ions present in the solution are:  $Ag^+\text{ and }NO_3^-$

For the given options:

Option 1: 0.1 M potassium chloride

The ions formed by the ionization of this solution are $K^+\text{ and }Cl^-$. As, no common ions are present. So, addition of this substance will not decrease the solubility of silver nitrate solution.

Option 2: 0.1 M barium chloride

The ions formed by the ionization of this solution are $Ba^{2+}\text{ and }Cl^-$. As, no common ions are present. So, addition of this substance will not decrease the solubility of silver nitrate solution.

Option 3: 0.1 M sodium nitrate

The ions formed by the ionization of this solution are $Na^+\text{ and }NO_3^-$. As, nitrate ions are present which is a common ion. So, addition of this substance will decrease the solubility of silver nitrate solution.

Option 4: 0.1 M sodium carbonate

The ions formed by the ionization of this solution are $Na^+\text{ and }CO_3^{2-}$. As, no common ions are present. So, addition of this substance will not decrease the solubility of silver nitrate solution.

Hence, the correct answer is Option 3.

Answer 2

3 is correct because the .1 moles of the NO3 will be better option to decrease the solubility of the Silver Nitrate.