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Questions and Answers
What is the pH value of a substance that is considered neutral?
What is the pH value of a substance that is considered neutral?
- 14
- 5
- 10
- 7 (correct)
Which substance listed has the lowest pH value, indicating it is the most acidic?
Which substance listed has the lowest pH value, indicating it is the most acidic?
- Blood
- Stomach acid (correct)
- Ammonia
- Pure rainwater
Which of the following substances is likely to have a basic pH?
Which of the following substances is likely to have a basic pH?
- Pure rainwater
- Hand soap (correct)
- Battery acid
- Stomach acid
What range of pH values represents basic substances?
What range of pH values represents basic substances?
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Which of the following substances would have a pH value closest to that of blood?
Which of the following substances would have a pH value closest to that of blood?
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Study Notes
pH Scale
- Measures the acidity or basicity of a substance
- Stands for "power of hydrogen"
- Ranges from 0 to 14
- Values below 7 are acidic
- Values above 7 are basic
- 7 is neutral
Examples of pH Values
- Stomach acid: 1.5
- Battery acid: Highly acidic
- Pure rainwater: 5.6 (Slightly acidic)
- Blood: 7.4 (Slightly basic)
- Ammonia: Highly basic
- Hand soap: Basic
- Bleach: Highly basic
- Drain cleaner: Highly basic
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