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Questions and Answers
What is the numerical range of the pH scale?
What is the numerical range of the pH scale?
A solution with a pH of 8 is considered acidic.
A solution with a pH of 8 is considered acidic.
False
What type of solution is indicated by a pH of 7?
What type of solution is indicated by a pH of 7?
neutral
A pH of 2 is considered to be highly ______.
A pH of 2 is considered to be highly ______.
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Match the following pH values with their corresponding description:
Match the following pH values with their corresponding description:
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If a solution has a pH of 5, how does its acidity compare to an solution with a pH of 7?
If a solution has a pH of 5, how does its acidity compare to an solution with a pH of 7?
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Bases form hydrogen ions ($H^+$) in solution.
Bases form hydrogen ions ($H^+$) in solution.
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What ions determine the pH of a basic solution?
What ions determine the pH of a basic solution?
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A solution with a high concentration of $H^+$ ions has a ______ pH.
A solution with a high concentration of $H^+$ ions has a ______ pH.
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Match the following substances to their properties:
Match the following substances to their properties:
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What is another term for basic?
What is another term for basic?
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In a neutral solution, are the concentrations of $H^+$ and $OH^-$ equal or unequal?
In a neutral solution, are the concentrations of $H^+$ and $OH^-$ equal or unequal?
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Increasing $CO_2$ levels is causing oceans to become more ________.
Increasing $CO_2$ levels is causing oceans to become more ________.
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What is the approximate pH of healthy human skin?
What is the approximate pH of healthy human skin?
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Match the following substances with their approximate pH values:
Match the following substances with their approximate pH values:
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Soaps with a pH of 7 or 8 can help maintain the natural pH balance of your skin.
Soaps with a pH of 7 or 8 can help maintain the natural pH balance of your skin.
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Because skin is slightly acidic, it may ________ with some metals.
Because skin is slightly acidic, it may ________ with some metals.
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Is tomato juice considered to be an acid or a base based on its pH?
Is tomato juice considered to be an acid or a base based on its pH?
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Lemon is approximately _____ times more _____ than milk.
Lemon is approximately _____ times more _____ than milk.
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A substance with a pH of 4 is ___ more ___ than a substance with a pH of 5.
A substance with a pH of 4 is ___ more ___ than a substance with a pH of 5.
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Study Notes
The pH Scale
- The pH scale measures acidity or basicity of a solution.
- The scale ranges from 0 to 14.
- A pH of 7 is neutral.
- Values below 7 are acidic.
- Values above 7 are basic/alkaline.
- The concentration of H+ ions determines acidity.
- The concentration of OH- ions determines basicity.
- A logarithmic scale means each whole number change on the pH scale represents a ten-fold change in concentration.
Acids
- Acids conduct electricity.
- Acids taste sour.
- Acids turn blue litmus paper red.
- Acids neutralize bases.
Bases
- Bases conduct electricity.
- Bases taste bitter.
- Bases feel slippery.
- Bases turn red litmus paper blue.
- Bases neutralize acids.
Acidic Solutions
- Acids form hydrogen ions (H+) in solution.
- The concentration of these hydrogen ions determines the pH.
- Higher concentrations of H+ indicate stronger acidity.
- Highly acidic solutions are corrosive and reactive.
- Strong acids require careful handling.
- Highly acidic solutions have low pH values.
Basic Solutions
- Basic solutions have a high concentration of hydroxide ions (OH-).
- Basic solutions have a pH greater than 7.
- Highly basic solutions are also corrosive and reactive.
- Strong bases require careful handling.
Neutral Solutions
- Solutions with a pH of 7 are neutral.
- Concentrations of H+ and OH- are equal and balance.
pH in Our Lives
- Living organisms are sensitive to small pH changes.
- Certain plants grow best at specific pH levels.
- Certain pH levels are significant for living organisms (e.g., human blood has a pH of approximately 7.4).
- Increasing CO2 levels in the atmosphere lead to ocean acidification, harming marine life.
- Healthy skin has a pH of about 5.5, which helps maintain skin health.
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Description
Explore the fundamentals of the pH scale, including the characteristics and behaviors of acids and bases. Understand how acidity and basicity are measured, and learn about the effects of these substances in solutions. This quiz will cover key concepts and definitions relevant to acids and bases.
