Chemistry Solubility Quiz

Solubility Concepts

• Solubility indicates a substance's ability to dissolve in a solvent; "soluble" means it can dissolve, while "insoluble" means it cannot.
• According to solubility rules, sulfate ions (SO4^2-) are soluble with calcium (Ca), confirming CaSO4 is soluble.

Definition of Solubility

• Inquiring about the solubility of a compound like Ca(OH)2(s) concerns its capacity to dissolve in water.

Saturated Solutions

• A saturated solution contains the maximum amount of dissolved solid/ions possible.
• A saturated solution is characterized by the equilibrium condition where the rate of precipitation equals the rate of dissolving.

Solubility Product Constant (Ksp)

• The solubility product constant, denoted as Ksp, represents the equilibrium constant for solubility reactions.
• Ksp can vary with temperature changes; typically, increased temperature decreases gas solubility, affecting Ksp.

Calculation of Solubility

• Solubility is derived from the value of x in an ICE (Initial, Change, Equilibrium) table related to the Ksp of the reaction.

Solubility Values for Calcium Hydroxide

• The solubility of Ca(OH)2 in water with a Ksp of 5.0 x 10^-6 is 0.0108 M, roughly equivalent to 0.8 g/L.

Copper Bromide Equilibrium Calculations

• For CuBr(s) with a Ksp of 6.27 x 10^-9, the concentration of Cu+ in equilibrium is 7.92 x 10^-5 M.
• In a saturated CuBr(s) solution with 0.10 M NaBr present, the solubility drops to 6.27 x 10^-8 M.