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Questions and Answers
What is the common ion effect?
What is the common ion effect?
- A phenomenon where the solubility of a slightly soluble salt is decreased by the addition of a common ion. (correct)
- An increase in the solubility of a slightly soluble salt due to the addition of a common ion.
- A method used to remove impurities from water by adding a salt.
- A type of precipitation reaction where a common ion is added to a solution.
What is the effect of increasing the concentration of the common ion on the solubility of the salt?
What is the effect of increasing the concentration of the common ion on the solubility of the salt?
- It decreases the solubility of the salt. (correct)
- It depends on the type of salt.
- It has no effect on the solubility of the salt.
- It increases the solubility of the salt.
Why is the common ion effect more pronounced for salts with smaller Ksp values?
Why is the common ion effect more pronounced for salts with smaller Ksp values?
- Because the equilibrium of the solubility reaction is shifted more easily. (correct)
- Because they have a higher solubility product.
- Because they have a higher concentration of ions.
- Because they have a lower concentration of ions.
What is the result of adding NaCl to a solution of AgCl?
What is the result of adding NaCl to a solution of AgCl?
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What is the importance of the common ion effect in precipitation reactions?
What is the importance of the common ion effect in precipitation reactions?
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What is the application of the common ion effect in water treatment?
What is the application of the common ion effect in water treatment?
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Study Notes
Solubility Product & pH
Common Ion Effect
- The common ion effect is a phenomenon where the solubility of a slightly soluble salt is decreased by the addition of a common ion.
- A common ion is an ion that is already present in the solution, often from a different source.
- The common ion effect occurs because the added ion shifts the equilibrium of the solubility reaction, reducing the solubility of the salt.
Factors Affecting the Common Ion Effect
- Concentration of the common ion: Increasing the concentration of the common ion increases the common ion effect, decreasing the solubility of the salt.
- Solubility product (Ksp): The common ion effect is more pronounced for salts with smaller Ksp values.
Examples of the Common Ion Effect
- Silver chloride (AgCl): Addition of NaCl to a solution of AgCl reduces the solubility of AgCl due to the common ion Cl-.
- Calcium carbonate (CaCO3): Addition of Ca(NO3)2 to a solution of CaCO3 reduces the solubility of CaCO3 due to the common ion Ca2+.
Importance of the Common Ion Effect
- Precipitation reactions: The common ion effect is important in precipitation reactions, where it can be used to control the formation of precipitates.
- Water treatment: The common ion effect is used in water treatment to remove impurities, such as calcium and magnesium ions, by adding a common ion to precipitate out the impurities.
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