Solubility Equilibria

Question 1

What is a saturated solution

Answer 1

• contains a maximum amount of solute in a given amount of solvent such that the ions are in equilibrium with the solid

Question 2

What is solubility

Answer 2

• it is the maximum amount of solute that dissolves in 1dm³ to form a standard solution at a stated temperature

Question 3

How to determine solubility of sparingly soluble salt at given temperature

Answer 3

• prepare the saturated solution by dissolving the salt until no more solid can dissolve, and undissolved solid remains in the solution
• filter to remove the undissolved solid
• perform a titration to determine the concentration of the salt that dissolved in the solution

Question 4

What is the common ion effect

Answer 4

• the phenomenon of reduced solubility with the addition of a common cation or anion to a sparingly soluble salts is called the common ion effect

Question 5

What is ionic product

Answer 5

• the product of concentration of constituent ions in the solution at that instant raised to the power of stoichiometric coefficient

Question 6

When and why does precipitation occur
- ionic product<K_sp
- ionic product=K_sp
- ionic product>K_sp

Answer 6

• no precipitation is observed since solution is still unsaturated
• the solution is saturated and the system is in equilibrium
• precipitation occurs until ionic product = K_sp