Acids & Salts (Triple) quiz

1. Describe the observations of the reaction of aluminium and dilute hydrochloric acid

no reaction

fizzing, metal disappears, metal floats, lilac flame seen

fizzing and metal disappears

fizzing, metal moves around, metal melts, metal disappears and metal floats

Question 1 of 21

2. Describe the method to prepare a pure dry sample of sodium chloride (soluble salt)

1) Heat hydrochloric acid in a beaker. 2) Add an equal amount of sodium oxide and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Allow the solution to cool so that hydrated crystals form. 6) Remove the crystals by filtration and wash with distilled water. 7) Dry by leaving in a warm place.

1) Heat hydrochloric acid in a beaker. 2) Add sodium oxide until excess and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Allow the solution to cool so that hydrated crystals form. 6) Remove the crystals by filtration and wash with distilled water. 7) Dry by leaving in a warm place.

1) Pipette 25cm³ of sodium hydroxide into a conical flask. 2) Do not add indicator. 3) (Using titration values)Titrate the known volume hydrochloric acid into conical flask containing alkali. 4) Transfer to an evaporating basin. 5) Heat the solution until a hot saturated solution forms. 6) Allow the solution to cool so that hydrated crystals form. 7) Remove the crystals by filtration and wash with distilled water. 8) Dry by leaving in a warm place.

1) Pipette 25cm³ of sodium hydroxide into a conical flask. 2) Add indicator. 3) (Using titration values)Titrate the known volume hydrochloric acid into conical flask containing alkali. 4) Transfer to an evaporating basin. 5) Heat the solution until a hot saturated solution forms. 6) Allow the solution to cool so that hydrated crystals form. 7) Remove the crystals by filtration and wash with distilled water. 8) Dry by leaving in a warm place.

Question 2 of 21

3.

Is copper nitrate soluble?

yes

slightly

no

Question 3 of 21

4. With universal indicator, what is the pH of a blue solution?

12-14

0-3

4-7

8-10

Question 4 of 21

5. Which two substances are added when testing for the sulfate (SO₄²⁻) ions? (2)

Dilute HNO₃, followed by silver nitrate (AgNO₃)

Dilute HCl, followed by barium chloride (BaCl₂)

Dilute HNO₃, followed by barium chloride (BaCl₂)

Dilute HCl, followed by silver nitrate (AgNO₃)

Question 5 of 21

6. What is an acid?

An acid is a corrosive substance

An acid is a compound that reacts with metals

An acid is a source of hydrogen ions, H⁺

An acid is a green solution

Question 6 of 21

7. State the formula for the copper (II) ion

Cu²⁻

Cu⁻

Cu²⁺

Cu⁺

Question 7 of 21

8. Describe the method to prepare a pure dry sample of copper sulfate (soluble salt)

1) Heat acid in a beaker. 2) Add base until excess and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Filter and wash with distilled water. 7) Dry by leaving in a warm place.

1) Heat acid in a beaker. 2) Add an equal amount of base and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Allow the solution to cool so that hydrated crystals form. 6) Remove the crystals by filtration and wash with distilled water. 7) Dry by leaving in a warm place.

1) Heat acid in a beaker. 2) Add base until excess and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Allow the solution to cool so that hydrated crystals form. 6) Remove the crystals by filtration and wash with distilled water. 7) Dry by leaving in a warm place.

1) Heat acid in a beaker. 2) Add an equal amount of base and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Filter and wash with distilled water. 7) Dry by leaving in a warm place.

Question 8 of 21

9. 7.485 g of a hydrated copper(II) sulphate CuSO₄.xH₂O was heated producing 4.785g of anhydrous copper(II) sulphate. What is the formula of the hydrated salt?

CuSO₄.10H₂O

CuSO₄.4H₂O

CuSO₄.7H₂O

CuSO₄.5H₂O

Question 9 of 21

10. When preparing hydrated copper(II) sulfate crystals starting from copper(II) oxide, why is the acid gently heated?

To increase the concentration of the acid

To ensure all the acid has reacted so there is no acid left

To boil the acid

To speed up the reaction

Question 10 of 21

11. Describe how you would carry out a flame test

Put solid onto a wire. Put into an orange flame

Put solid onto a wire. Put into a blue flame

Dissolve solid in acid. Put solution onto wire. Put into an blue flame

Dissolve solid in acid. Put solution onto wire. Put into an orange flame

Question 11 of 21

12. A pure, dry sample of an insoluble salt can be prepared starting with two soluble reactants. What is this method called?

Crystallisation method

Titration method

Precipitation method

Neutralisation method

Question 12 of 21

13. In the flame test for copper (II) ions what colour is the result?

Red

Yellow

Lilac

Blue-green

Question 13 of 21

14. What is defined as a proton acceptor?

A base

An acid

An ore

An alkali

Question 14 of 21

15. What is the test for NH₄⁺ ions and what is the result?

Add NaOH. The gas (ammonia) bleaches damp red litmus paper

Add silver nitrate, and a white precipitate forms

Gently heat. The gas (ammonia) bleaches damp red litmus paper

Add NaOH. The gas (ammonia) turns damp red litmus paper blue.

Question 15 of 21

16. What is a base?

An unreactive form of an alkali that is used to store it

A compound that reacts with an acid to form hydrogen

A substance which can neutralise an acid, forming salt and water only

A source of hydroxide ions, OH⁻

Question 16 of 21

17. Is iron (III) hydroxide acidic or basic?

Depends on the conditions

Basic (as metal hydroxides are basic)

Acidic (as metal hydroxides are acidic)

Neutral (as metal hydroxides are neutral)

Question 17 of 21

18. What is the universal indicator colour of a pH 8-10 solution?

Yellow

Green

Blue

Red

Question 18 of 21

19. An acid is called a proton _________

An acid is a proton sink

An acid is a proton solvent

An acid is a proton donor

An acid is a proton acceptor

Question 19 of 21

20. Which gas will bleach moist litmus paper?

Hydrogen

Carbon dioxide

Ammonia

Chlorine

Question 20 of 21

21. What method would be followed to prepare a sample of pure, dry lead (II) sulfate?

Combustion method

Excess solid method

Titration method

Precipitation method

Question 21 of 21

Acids & Salts (Triple) quiz

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