Podcast
Questions and Answers
What is the function of litmus in identifying solutions?
What is the function of litmus in identifying solutions?
- It neutralizes the solutions.
- It increases the pH of basic solutions.
- It measures the concentration of the solution.
- It indicates whether a solution is acidic or basic. (correct)
What color does blue litmus paper turn when placed in an acidic solution?
What color does blue litmus paper turn when placed in an acidic solution?
- Blue
- Yellow
- Red (correct)
- Purple
A solution turns red litmus paper blue. Which of the following is true?
A solution turns red litmus paper blue. Which of the following is true?
- It is a neutral solution.
- It is an acidic solution.
- It has a pH of 7.
- It is a basic solution. (correct)
What does a pH of 7 indicate about a solution?
What does a pH of 7 indicate about a solution?
Which of the following pH values indicates the highest acidity?
Which of the following pH values indicates the highest acidity?
A substance has a pH of 2. Which of the following best describes it?
A substance has a pH of 2. Which of the following best describes it?
According to the provided content, which of the following statements is true, regarding using litmus paper?
According to the provided content, which of the following statements is true, regarding using litmus paper?
What is the pH of pure water?
What is the pH of pure water?
Which property is characteristic of solutions formed by acids?
Which property is characteristic of solutions formed by acids?
A solution that can cause serious burns on skin is an indication of what property?
A solution that can cause serious burns on skin is an indication of what property?
If a solution feels slippery to the touch, what property does it likely possess?
If a solution feels slippery to the touch, what property does it likely possess?
What type of reaction is associated with solutions of both acids and bases?
What type of reaction is associated with solutions of both acids and bases?
Which of the following best describes the effect of acids on metals?
Which of the following best describes the effect of acids on metals?
A solution that is safe enough to drink but still possesses acidic properties would likely be what?
A solution that is safe enough to drink but still possesses acidic properties would likely be what?
Which of these would likely react with (breakdown) fats and oils?
Which of these would likely react with (breakdown) fats and oils?
What makes hydrochloric acid different from lemon juice?
What makes hydrochloric acid different from lemon juice?
Which of the following has the lowest pH value?
Which of the following has the lowest pH value?
A solution with a pH of 11.1 would be considered:
A solution with a pH of 11.1 would be considered:
Which of the following has a pH closest to neutral?
Which of the following has a pH closest to neutral?
Which of these is the correct order of pH, from lowest to highest?
Which of these is the correct order of pH, from lowest to highest?
According to the figure, which of these is the most basic?
According to the figure, which of these is the most basic?
If a substance is measured to have a pH between 7 and 14 inclusive, that substance is a:
If a substance is measured to have a pH between 7 and 14 inclusive, that substance is a:
Based on the figure, what trend is observed in the pH values as we move from lemon juice to milk of magnesia?
Based on the figure, what trend is observed in the pH values as we move from lemon juice to milk of magnesia?
Which substance on the list is most likely to neutralize an acid?
Which substance on the list is most likely to neutralize an acid?
Flashcards
Acids
Acids
Compounds that form solutions with a sour taste, react with metals, and can cause burns on skin.
Bases
Bases
Compounds that form solutions with a bitter taste, feel slippery, react with fats and oils, and can cause burns on skin.
Sour taste
Sour taste
A property of acids that gives them a sour taste.
React with metals
React with metals
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Can cause burns on skin
Can cause burns on skin
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Bitter taste
Bitter taste
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Feel slippery
Feel slippery
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React with fats and oils
React with fats and oils
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pH scale
pH scale
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Neutral
Neutral
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Indicator
Indicator
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Acidity and pH value
Acidity and pH value
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Strong Acid
Strong Acid
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Neutral compound
Neutral compound
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pH
pH
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Acidic solution
Acidic solution
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Basic solution
Basic solution
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Strong base
Strong base
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Study Notes
Measuring the Acidity of Solutions
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Acids are compounds that form solutions with a sour taste, react with (corrode) metals, and can cause burns on skin. Some acids are harmless (e.g., lemon juice), while others are extremely dangerous (e.g., hydrochloric acid).
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Bases are compounds that form solutions with a bitter taste, feel slippery, react with (break down) fats and oils, and can cause burns on skin. Some bases are harmless (e.g., baking soda solution), but others should be handled with extreme care (e.g., drain cleaner).
Identifying Acids and Bases
- Litmus is a dye used to identify acids and bases. Acidic solutions turn blue litmus paper red, while basic solutions turn red litmus paper blue.
pH Scale
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The pH scale measures the acidity or basicity of a solution. Numbers below 7 indicate acidity, with lower values meaning more acidic. Numbers above 7 indicate basicity, with higher values meaning more basic. A pH of 7 is neutral.
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Examples of pH values are shown in Figure 4 (e.g., lemon juice has a pH of approximately 2.0, baking soda has a pH of approximately 8.2).
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