WorksheetsGCSE 1.8 Acids Bases and Salts
Total questions: 40
Worksheet time: 20mins
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.
What is the result of adding limewater to carbon dioxide?
The solution turns blue.
The solution turns red.
The solution turns milky.
The solution remains colourless.
What is a salt in terms of its formation in a chemical reaction?
A compound formed when hydrogen ions in an acid are replaced by metal ions or ammonium ions.
A compound formed when metal ions are replaced by hydrogen ions in an acid.
A compound formed when hydroxide ions are replaced by metal ions in an alkali.
A compound formed when metal ions are replaced by hydroxide ions in an alkali.
What is the color of red litmus paper in an alkali?
Red
Blue
Green
Yellow
What is the color of blue litmus paper in an acid?
Red
Blue
Green
Yellow
What color does phenolphthalein turn in an alkaline solution?
Colourless
Red
Orange
Pink
Which of the following is a strong acid?
Ethanoic acid
Carbonic acid
Sulfuric acid
Ammonia solution
What is the pH range for a strong alkali?
pH 0-2
pH 3-6
pH 7
pH 12-14
What color does universal indicator turn in a neutral solution?
Red
Orange or yellow
Green
Dark blue or purple
What is the hazard symbol for dilute solutions of acids?
Corrosive
Toxic
Flammable
Caution
Which salt is produced when hydrochloric acid reacts?
Sulfate
Nitrate
Chloride
Phosphate
What is the general equation for the reaction of a metal with an acid?
metal + acid → salt + water
metal + acid → salt + hydrogen
metal + acid → salt + carbon dioxide
metal + acid → salt + oxygen
How can the presence of hydrogen gas be confirmed?
By a color change to blue
By a popping sound when a lighted splint is applied
By the formation of bubbles
By a change to milky limewater
What is the general equation for the reaction of a base with an acid?
base + acid → salt + hydrogen
base + acid → salt + carbon dioxide
base + acid → salt + water
base + acid → salt + oxygen
What type of reaction occurs when a base reacts with an acid?
Combustion reaction
Neutralisation reaction
Decomposition reaction
Displacement reaction
What is the observation when copper(II) oxide reacts with sulfuric acid?
Formation of bubbles
Solution changes from colourless to blue
Solution changes from blue to colourless
Formation of a white precipitate
What is the general equation for the reaction of an acid with a carbonate?
acid + carbonate → salt + water + carbon dioxide
acid + carbonate → salt + hydrogen
acid + carbonate → salt + oxygen
acid + carbonate → salt + water
How can the presence of carbon dioxide be confirmed?
By a popping sound when a lighted splint is applied
By the formation of bubbles
By passing the gas through colourless limewater, which changes to milky
By a colour change to blue
Which of the following is a product of the reaction between sodium carbonate and hydrochloric acid?
Sodium hydroxide
Sodium chloride
Sodium sulfate
Sodium nitrate
What observation is made when sodium carbonate reacts with hydrochloric acid?
Blue solution produced
White solid forms
Colourless solution produced
No reaction
What is the purpose of adding an indicator in the titration method of preparing salts?
To measure the volume of acid
To determine when the acid and alkali are neutralized
To evaporate the solution
To crystallize the salt
When preparing a pure dry sample of a salt, what is the next step after heating the filtrate to half volume
Add more acid
Leave to cool and crystallize
Add an indicator
Measure the volume of the solution
What is the general method of adding acid to alkali (or vice versa) in the presence of an indicator called?
Filtration
Crystallization
Titration
Evaporation
Complete the symbol equation for this reaction: HCl + NaOH → _______ + _______
NaCl + H₂O
NaCl + H₂
Na + H₂O
Na + H₂
What is the name of the salt formed when copper(II) oxide reacts with sulfuric acid?
Copper(II) chloride
Copper(II) nitrate
Copper(II) sulfate
Copper(II) phosphate
Which part of the name "copper(II) sulfate" comes from the acid used in the reaction?
Copper(II)
Sulfate
Copper
Sulfur
Which acid produces a salt called ethanoate when it reacts?
Hydrochloric acid
Nitric acid
Sulfuric acid
Ethanoic acid
What is the general name given to one of the compounds formed when an acid is neutralised?
Base
Salt
Alkali
Metal
Select the balanced symbol equation for the reaction between calcium carbonate and hydrochloric acid.
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
CaCO₃ + HCl → CaCl₂ + H₂O + CO₂
CaCO₃ + 2HCl → CaCl₂ + H₂O
CaCO₃ + HCl → CaCl₂ + CO₂
Describe the process of obtaining pure, dry crystals of hydrated calcium chloride from a solution of calcium chloride.
Evaporation followed by cooling
Filtration followed by evaporation
Crystallization followed by filtration
Distillation followed by crystallization
What common name is used for calcium hydroxide solution?
Limewater
Bleach
Vinegar
Baking soda
