Virtual Lab Simulation
Scenario: You are going to make a pure dry sample of a salt in the lab. Choose the reactants and follow the safe procedure. Then click Start Animation & Method to see the steps and visuals.
1. Choose Your Reactants
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2. Method Steps (will animate when started)
Select your acid and base, then click Start Animation & Method.
3. Observations & Safety
Safety first! Wear goggles and a lab coat. Never taste chemicals. Handle hot apparatus carefully.
Assessment: Making Salts
Total marks: 30 (20 MCQ + 10 Fill-in-the-Blanks)
A. Multiple-Choice Questions (20)
1. Which is the best method to make pure crystals of copper(II) sulfate from copper(II) oxide and dilute sulfuric acid?
2. Which combination will produce a salt, water and carbon dioxide?
3. The general name for a reaction between an acid and a base to form a salt and water is:
4. Which piece of apparatus is essential for a titration method to make a soluble salt?
5. A student wants to make sodium chloride crystals from hydrochloric acid and sodium hydroxide. Which method is most appropriate?
6. Which method is used to obtain an insoluble salt from two solutions?
7. Why is an excess of insoluble base added to the warm acid when making a soluble salt?
8. After adding excess base and filtering, what is the next step to obtain salt crystals?
9. Which of the following salts is typically made by a precipitation reaction?
10. Which indicator is commonly used for strong acid–strong alkali titrations in school labs?
11. Which statement about crystallisation is correct?
12. Why is the acid warmed gently before adding an insoluble base?
13. Which pair of reactants would be most suitable to prepare zinc sulfate crystals?
14. In a precipitation reaction, the solid formed is called:
15. When making an insoluble salt by precipitation, what happens to the filtrate?
16. Which safety precaution is most important when heating an acid in the lab?
17. Which salt can be prepared by reacting nitric acid with potassium hydroxide?
18. During titration, why is the conical flask placed on a white tile?
19. Which step helps to obtain larger, well-formed crystals of a salt?
20. A student wants to prepare calcium carbonate, an insoluble salt. Which combination is suitable?
B. Fill-in-the-Blank Questions (10)
Type single keywords or short phrases. Spelling counts, but answers are not case-sensitive.
1. The process used to separate an insoluble solid from a liquid using filter paper and a funnel is called __________________.
2. The process in which a hot saturated solution is allowed to cool so that solid forms is called __________________.
3. A reaction between an acid and a base to form a salt and water is called __________________.
4. When making a soluble salt using an insoluble base, the base is added in __________________ to ensure all the acid reacts.
5. In a titration, the accurate volume of solution added from the burette is called the __________________.
6. A salt that does not dissolve in water is described as __________________.
7. In a precipitation reaction, the liquid that passes through the filter paper is called the __________________.
8. Copper(II) oxide is an example of a metal __________________ used to make copper(II) salts.
9. When making crystals, heating the solution gently to remove some water is called partial __________________.
10. Before starting any experiment with acids and bases, students should always wear safety __________________ and a lab coat.