Prac 5B - Relative acidity

• Chemistry
• Secondary Education
• Age 12,13

Prac 2.5b - Investigating relative acidity

Topic 7. Acids, Bases, and Salts 

20 March 2024

• use a variety of acids to explore the differences in their relative acidity
• make conclusions about different acids based on observations and measurements made in a number of separate experiments

Our Learning Goals

• base - a substance that neutralises an acid, producing salt and water as the only products; bases act as proton acceptors

Keyword

• Report any acid spills to your teacher immediately. 
• Limewater, sulfuric acid and hydrochloric acid are moderate hazards.
•  Copper (II) oxide is corrosive, a moderate hazard and harmful to the aquatic environment. Waste from experimental use must not be poured down the drain.
• Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
• You will need to stand up if you need a hot water bath to warm the mixture at step 3 of the method.
• Ethanoic acid is irritant.
• Magnesium ribbon is flammable.
• Wear eye protection throughout. 

SAFETY ⚠️

Which of the four acids is the weakest (sulfuric acid, hydrochloric acid, ethanoic acid, or methanoic acid)?

Experimental Question

Write your team hypothesis or prediction.

Hypothesis

• Report any acid spills to your teacher immediately. 
• Limewater, sulfuric acid and hydrochloric acid are moderate hazards.
•  Copper (II) oxide is corrosive, a moderate hazard and harmful to the aquatic environment. Waste from experimental use must not be poured down the drain.
• Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
• You will need to stand up if you need a hot water bath to warm the mixture at step 3 of the method.
• Ethanoic acid is irritant.
• Magnesium ribbon is flammable.
• Wear eye protection throughout. 

SAFETY ⚠️

Prac 2.5c - Investigating relative alkalinity

Topic 7. Acids, Bases, and Salts 

20 March 2024

• perform a simple titration
• use chemical tests to determine the products produced when reacting alkalis

Our Learning Goals

• Report any alkali spills to your teacher immediately. 
• Dilute sodium hydroxide and calcium hydroxide solution are irritants.
• Hydrochloric acid is a moderate hazard.
• Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
• Wear eye protection throughout. 

SAFETY ⚠️

Which of the two alkaline solutions is stronger: sodium hydroxide or calcium hydroxide?

Experimental Question

Write your team hypothesis or prediction.

Hypothesis

• Report any alkali spills to your teacher immediately. 
• Dilute sodium hydroxide and calcium hydroxide solution are irritants.
• Hydrochloric acid is a moderate hazard.
• Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
• Wear eye protection throughout. 

SAFETY ⚠️

• Wash the materials you used.
• Clean your table.
• Return the washed/ cleaned materials.

Clean-up

Prac 2.5 - Weak and Strong Acids

Topic 7. Acids, Bases, and Salts 

18 March 2024

• Share the results of your experiment.
• What similarities and differences have you noticed?

Wrap-up