GCSE 1.8 Acids Bases and Salts

What colour does phenolphthalein turn in an acidic solution?

• Pink

• Colourless

• Red

• Blue

What is the pH range for a strong acid?

• 0-2

• 3-6

• 7

• 8-11

Which of the following pH values indicates a neutral solution?

• 0

• 3

• 7

• 12

What ions do acids produce when they dissolve in water?

• OH⁻ ions

• H⁺ ions

• Na⁺ ions

• Cl⁻ ions

What happens to the pH of a solution as the concentration of hydrogen ions increases?

• The pH increases

• The pH decreases

• The pH remains the same

• The pH becomes neutral

Which of the following is an example of a strong acid?

• Ethanoic acid

• Carbonic acid

• Hydrochloric acid

• Ammonia

Which of the following is an example of a weak alkali?

• Sodium hydroxide

• Potassium hydroxide

• Ammonia solution

• Nitric acid

Explain the terms "dilute" and "concentrated" in terms of the amount of substances in solution.

• Dilute solutions have a high amount of solute.

• Concentrated solutions have a low amount of solute.

• Dilute solutions have a low amount of solute.

• Concentrated solutions have a high amount of solvent.

What is the ionic equation for the neutralisation reaction between hydrogen ions in an acid and hydroxide ions in an alkali?

• H⁺ (aq) + OH⁻ (aq) → H₂O (l)

• H₂ (g) + O₂ (g) → H₂O (l)

• H⁺ (aq) + OH⁻ (aq) → H₂ (g)

• H₂O (l) → H⁺ (aq) + OH⁻ (aq)

What is the result of applying a lighted splint to hydrogen gas?

• The splint extinguishes.

• A popping sound is produced.

• The splint burns with a blue flame.

• The splint burns with a green flame.