Common Ion Effect in Solubility

The video tutorial explains the common ion effect in solubility product (KSP) calculations. It begins with an introduction to the concept, followed by detailed examples involving lead chloride with calcium chloride and silver chromate with potassium chromate. The tutorial demonstrates how the presence of a common ion affects solubility, using stoichiometry and KSP calculations. It concludes with a summary of key takeaways, emphasizing the importance of not combining substances that do not react chemically.

What is the primary focus of the common ion effect in solubility product calculations?

• Increasing the solubility of salts

• Decreasing the solubility of salts

• Changing the color of solutions

• Increasing the temperature of solutions

In the example with lead chloride and calcium chloride, what is the common ion?

• Lead ion

• Calcium ion

• Chloride ion

• Nitrate ion

Why can the term '2s' be neglected in the solubility calculation of lead chloride with a common ion?

• Because it is a constant

• Because it is always zero

• Because it is much smaller than the other terms

• Because it is not relevant to the calculation

How does the addition of a common ion affect the solubility of a salt?

• It changes the color of the solution

• It decreases the solubility

• It has no effect on the solubility

• It increases the solubility

What was the solubility of lead chloride in pure water compared to with a common ion?

• The same in both

• Higher in pure water

• Lower in pure water

• Cannot be determined

In the silver chromate example, what is the role of potassium chromate?

• It acts as a catalyst

• It increases the temperature

• It provides a common ion

• It changes the color of the solution

What is the molarity of chromate ion in the silver chromate example?

• 0.1 M

• 0.01 M

• 0.005 M

• 0.5 M

What is a common mistake when dealing with common ion problems?

• Forgetting to balance equations

• Including solids in KSP calculations

• Using incorrect units

• Ignoring temperature changes

Why should solids not be included in KSP calculations?

• They are always zero

• They are not part of the reaction

• They do not affect the equilibrium

• They do not dissolve

What should you remember about reactions in a beaker with multiple substances?

• They change color when mixed

• They may not react even if present together

• They never react together

• They always react together