use the universal indicator to quantify the pH value of different acids
identify the product produced when reacting acids with metals
evaluate the strength of acids by making several different observations
Our Learning Goals
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acid - a substance that dissolves in water, producing H+ (aq) ions - a solution of acid turns litmus red and has a pH below 7; it acts as a proton donor
alkalis - soluble bases that produce OH-(aq) ions in water - a solution of an alkali turns litmus blue and has a pH above 7
indicator - a substance that changes colour when added to acidic or alkaline solutions, e.g., litmus or thymolphthalein
methyl orange - an acid-base indicator that is red in acidic and yellow in alkaline solutions
pH scale - a scale running from below 0 to 14, used for expressing the acidity or alkalinity of a solution; a neutral solution has a pH of 7
Universal indicator - a mixture of indicators that has different colours in solutions of different pH
Keywords
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Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts
18 March 2024
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Report any acid spills to your teacher immediately. The universal indicator will stain your clothing and skin.
Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
Sodium hydroxide and sodium carbonates are irritants.
Wear eye protection throughout.
SAFETY ⚠️
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Materials Checklist
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Which of the two acids (Acid X and Acid Y) could be strong?
Experimental Question
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Write your team hypothesis or prediction.
Hypothesis
timer
2:00
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Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts
18 March 2024
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Follow the steps on pages 114, 115, 116of your practical workbook.
Experiment Proper
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Report any acid spills to your teacher immediately. The universal indicator will stain your clothing and skin.
Methyl orange indicator is corrosive, flammable, a health and moderate hazard, hazardous to the aquatic environment, and acutely toxic.
Sodium hydroxide and sodium carbonates are irritants.
Wear eye protection throughout.
SAFETY ⚠️
timer
50:00
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Wash the materials you used.
Clean your table.
Return the washed/ cleaned materials.
Clean-up
timer
7:00
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Prac 2.5 - Weak and Strong Acids
Topic 7. Acids, Bases, and Salts
18 March 2024
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Share the results of your experiment.
What similarities and differences have you noticed?
