Effects of pH on Solubility

The video tutorial discusses the relationship between pH and solubility, focusing on how pH changes can affect the equilibrium position of solubility reactions. It explains the common ion effect and how increasing or decreasing pH can shift reactions towards reactants or products, affecting solubility. Examples include the impact of sodium hydroxide and HCl on chromate and dichromate equilibrium, and how pH changes influence calcium ion concentration in solutions.

What is the relationship between pH and solubility discussed in the introduction?

• Solubility is only affected by temperature.

• KSP is unrelated to pH.

• pH has no effect on solubility.

• pH affects the equilibrium position of solubility reactions.

How does an increase in pH affect the solubility of a substance?

• It only affects the color of the solution.

• It makes the substance less soluble.

• It has no effect on solubility.

• It makes the substance more soluble.

What happens to the concentration of hydroxide ions when pH increases?

• It decreases.

• It increases.

• It remains the same.

• It becomes zero.

In the example of calcium hydroxide, what happens when the pH decreases?

• Calcium hydroxide becomes less soluble.

• The reaction reverses.

• Calcium hydroxide becomes more soluble.

• The reaction stops completely.

What color change occurs when sodium hydroxide is added to the chromate-dichromate system?

• The solution turns red.

• The solution turns blue.

• The solution turns yellow.

• The solution turns green.

What is the effect of adding HCl to the chromate-dichromate equilibrium?

• The solution becomes more yellow.

• The solution becomes colorless.

• The solution becomes more orange.

• The solution turns purple.

How does a decrease in pH affect the concentration of calcium ions in a solution?

• The concentration increases.

• The concentration remains unchanged.

• The concentration decreases.

• The concentration becomes zero.

What is the common ion effect in the context of calcium ions and pH changes?

• It increases the solubility of all ions.

• It decreases the solubility of all ions.

• It has no effect on equilibrium.

• It affects the equilibrium by shifting it towards the reactants or products.

What happens to carbonate ions when the pH decreases?

• Their concentration increases.

• Their concentration decreases.

• Their concentration remains the same.

• They precipitate out of the solution.

What is the overall effect of decreasing pH on the solubility of calcium carbonate?

• It precipitates out of the solution.

• It becomes less soluble.

• It becomes more soluble.

• It remains unchanged.