Questions and Answers
Is CaSO4 soluble or insoluble?
What is meant by solubility in the context of Ca(OH)2(s)?
That the compound can dissolve in water.
A saturated solution means that it has not dissolved as much solid/ions as it can.
False
What is the symbol for the solubility constant?
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How is solubility calculated?
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What is the solubility of Ca(OH)2(s) if the Ksp for calcium hydroxide is 5.0 x 10^-6?
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Find the concentration of Cu+ in equilibrium with CuBr(s) given Ksp (CuBr) = 6.27 x 10^-9
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What would be the solubility of CuBr(s) in the presence of 0.10 M NaBr?
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Study Notes
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.
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Description
Test your knowledge on solubility concepts in chemistry with this quiz. You'll answer questions about the solubility of various compounds and what it means to have a saturated solution. Perfect for reinforcing your understanding of solubility rules and definitions.
