C7 Acids, bases & Salts

Which of the following is the best definition of a soluble salt?

• A salt that dissolves in water to form a solution.
• A salt that does not dissolve in water.
• A salt that is insoluble in all solvents.
• A salt that reacts with water to form a gas.

What process is used to prepare a soluble salt by reacting an acid with an alkali?

• Titration
• Precipitation
• Filtration
• Distillation

Which of the following is a hydrated substance?

• Iron oxide
• Copper(II) sulfate pentahydrate
• Sodium chloride
• Calcium carbonate

What is the difference between a hydrated substance and an anhydrous substance?

• A hydrated substance is an acid, while an anhydrous substance is a base.
• A hydrated substance is soluble in water, while an anhydrous substance is not.
• A hydrated substance is a liquid, while an anhydrous substance is a solid.
• A hydrated substance contains water chemically bound to its structure, while an anhydrous substance does not.

Which of the following methods is used to prepare an insoluble salt?

• Distillation
• Crystallization
• Precipitation
• Titration

When preparing a soluble salt by reacting an acid with an excess insoluble base, what is the purpose of using an excess base?

• To speed up the reaction.
• To neutralize the acid.
• To make the salt more soluble.
• To ensure all the acid has reacted.

What is the name of the process used to remove the excess insoluble base after the reaction with an acid?

• Evaporation
• Distillation
• Crystallization
• Filtration

How is the soluble salt obtained after the reaction of an acid with an excess metal?

• The solution is neutralized with an alkali and then evaporated.
• The excess metal is filtered off and the solution is evaporated to crystallize the salt.
• The solution is distilled to separate the salt from the water.
• The salt precipitates out of solution and is filtered off.

In a precipitation reaction, how can you tell that an insoluble salt has formed?

• A gas will be produced.
• A precipitate (solid) will form in the solution.
• The solution will get hot.
• The solution will change color.

Which of the following is NOT a method for purifying a soluble salt?

• Washing with cold distilled water
• Drying in a warm oven
• Recrystallization
• Titration