Starter quiz
- What is the pH range of strong acids?
- 0 to 3 ✓
- 7 to 10
- 10.1 to 14
-
- What is the pH of pure water?
- 0
- 7 ✓
- 14
-
- What is the pH range of weak bases (alkalines)?
- 0 to 6.9
- 7.1 to 10 ✓
- 10.1 to 14
-
- Which of the following is a common laboratory apparatus used to measure pH accurately?
- Beaker
- Bunsen burner
- Universal indicator
- pH meter ✓
-
- What type of water might contain dissolved chlorine, affecting its pH?
- Distilled water
- Pure water
- Tap water ✓
-
- What does it mean if a substance has dissolved in water?
- It changes colour.
- Its particles separate and spread throughout the water. ✓
- It turns into a gas.
-
Exit quiz
- Which method is used to measure pH and requires calibration?
- pH meter ✓
- pH paper
- Universal indicator solution
-
- What does a pH of 7 in water indicate?
- The water is acidic.
- The water is alkaline.
- The water is neutral. ✓
-
- Why is it important to measure the pH of water samples?
- To assess water quality and identify impurities. ✓
- To change the water's colour.
- To make the water taste better.
-
- Which of the following substances dissolves in both groundwater and seawater?
- Sand
- Salts ✓
- Oil
- Minerals ✓
-
- What can cause the pH of rainwater to be slightly acidic?
- Dissolved gases ✓
- Dissolved salt
- Pure water
-
- What does a low pH value in water indicate?
- The presence of acidic substances. ✓
- The water is alkaline.
- The water is pure.
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The pH of water samples can be determined using appropriate methods and/or instruments e.g pH meter.
- pH data can be analysed to assess if water contains impurities.
- Different substances dissolve in different types of water.
- The substances that dissolve in different waters can affect the water's acidity or alkalinity (i.e. its pH).
- Pure water is necessary for laboratory tests; it must be neutral (i.e. pH 7).
Common misconception
All water samples are neutral (i.e. pH of 7).
The acidity / alkalinity of water samples is affected by the dissolved substances in each sample.
Keywords
Sample - A smaller portion of a larger quantity of a substance.
Dissolve - When a substance's particles separate and spread throughout the particles of a solvent resulting in it no longer being seen.
Ph - A number that shows the alkalinity or acidity of a solution.
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