Predicting the Relative pH of Salt Solutions

The video tutorial explains how to predict the relative pH of salt solutions using two methods: identifying the acid and base that form the salt, and labeling each ion based on its behavior in water. Examples include sodium chloride, potassium fluoride, and ammonium bromide, illustrating neutral, basic, and acidic salts, respectively. The tutorial emphasizes the importance of recognizing strong and weak acids and bases, and concludes with a summary of the methods and additional notes on reaction completion and equilibrium.

What are the two methods discussed for predicting the pH of salt solutions?

• Using the density of the solution or the mass of the solution.

• Using the combination of acid and base that made the salt or labeling each ion based on its behavior in water.

• Using the color change of the solution or measuring the temperature change.

• Using the molarity of the solution or the volume of the solution.

In the first method, what do cations come from?

• Water

• Salts

• Bases

• Acids

What is the predicted pH of sodium chloride using the first method?

• Cannot be determined

• Exactly 7

• Greater than 7

• Less than 7

In the second method, what is the nature of the sodium ion in sodium chloride?

• Neutral

• Amphoteric

• Basic

• Acidic

What is the predicted pH of potassium fluoride using the first method?

• Cannot be determined

• Exactly 7

• Greater than 7

• Less than 7

In the second method, what is the nature of the fluoride ion in potassium fluoride?

• Acidic

• Basic

• Neutral

• Amphoteric

What is the predicted pH of ammonium bromide using the first method?

• Cannot be determined

• Less than 7

• Greater than 7

• Exactly 7

What is the nature of the ammonium ion in ammonium bromide?

• Neutral

• Basic

• Amphoteric

• Acidic

What are the possible labels for anions?

• Neutral and acidic

• Neutral and basic

• Neutral and amphoteric

• Basic and acidic

What type of reactions have completion arrows?

• Reactions with amphoteric reactants

• Reactions with neutral reactants

• Reactions with only weak reactants

• Reactions with at least one strong reactant