Podcast
Questions and Answers
A substance that accepts two protons (H+ ions) in a solution is a base.
A substance that accepts two protons (H+ ions) in a solution is a base.
False
Sulfuric acid (H2SO4) is a weak acid.
Sulfuric acid (H2SO4) is a weak acid.
False
A pH of 9 indicates a highly acidic solution.
A pH of 9 indicates a highly acidic solution.
False
Citric acid (C6H8O7) is a strong acid.
Citric acid (C6H8O7) is a strong acid.
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A neutralization reaction produces a salt and oxygen gas.
A neutralization reaction produces a salt and oxygen gas.
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Ammonia (NH3) is a strong base.
Ammonia (NH3) is a strong base.
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A buffer solution is a solution that changes pH drastically when an acid or base is added.
A buffer solution is a solution that changes pH drastically when an acid or base is added.
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Hydrochloric acid (HCl) turns litmus paper blue.
Hydrochloric acid (HCl) turns litmus paper blue.
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A pH of 5 indicates a highly basic solution.
A pH of 5 indicates a highly basic solution.
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Study Notes
Acids and Bases
Definitions
- Acid: a substance that donates a proton (H+ ion) in a solution
- Base: a substance that accepts a proton (H+ ion) in a solution
Properties of Acids and Bases
-
Acid properties:
- Taste sour
- Conduct electricity
- Turn litmus paper red
- React with metals to produce hydrogen gas
-
Base properties:
- Taste bitter
- Feel slippery
- Turn litmus paper blue
- React with oils to produce soap
pH Scale
- pH: a measure of the concentration of hydrogen ions (H+) in a solution
- pH range: 0-14, with 7 being neutral (neither acidic nor basic)
- Acidic: pH < 7
- Basic: pH > 7
Strong and Weak Acids and Bases
-
Strong acid: completely dissociates in water, releasing all H+ ions
- Examples: hydrochloric acid (HCl), sulfuric acid (H2SO4)
-
Weak acid: partially dissociates in water, releasing some H+ ions
- Examples: citric acid (C6H8O7), acetic acid (CH3COOH)
-
Strong base: completely dissociates in water, releasing all OH- ions
- Examples: sodium hydroxide (NaOH), calcium hydroxide (Ca(OH)2)
-
Weak base: partially dissociates in water, releasing some OH- ions
- Examples: ammonia (NH3), trimethylamine (N(CH3)3)
Acid-Base Reactions
-
Neutralization reaction: a reaction between an acid and a base that produces a salt and water
- Example: HCl + NaOH → NaCl + H2O
-
Buffer solution: a solution that resists changes in pH when an acid or base is added
- Example: a mixture of acetic acid and sodium acetate
Acids and Bases
Definitions
- Acid: a substance that donates a proton (H+ ion) in a solution
- Base: a substance that accepts a proton (H+ ion) in a solution
Properties
Acid Properties
- Taste sour
- Conduct electricity
- Turn litmus paper red
- React with metals to produce hydrogen gas
Base Properties
- Taste bitter
- Feel slippery
- Turn litmus paper blue
- React with oils to produce soap
pH Scale
- pH: a measure of the concentration of hydrogen ions (H+) in a solution
- pH range: 0-14, with 7 being neutral (neither acidic nor basic)
- Acidic: pH < 7
- Basic: pH > 7
Strong and Weak Acids and Bases
Strong Acids
- Completely dissociate in water, releasing all H+ ions
- Examples: hydrochloric acid (HCl), sulfuric acid (H2SO4)
Weak Acids
- Partially dissociate in water, releasing some H+ ions
- Examples: citric acid (C6H8O7), acetic acid (CH3COOH)
Strong Bases
- Completely dissociate in water, releasing all OH- ions
- Examples: sodium hydroxide (NaOH), calcium hydroxide (Ca(OH)2)
Weak Bases
- Partially dissociate in water, releasing some OH- ions
- Examples: ammonia (NH3), trimethylamine (N(CH3)3)
Acid-Base Reactions
- Neutralization reaction: a reaction between an acid and a base that produces a salt and water
- Example: HCl + NaOH → NaCl + H2O
- Buffer solution: a solution that resists changes in pH when an acid or base is added
- Example: a mixture of acetic acid and sodium acetate
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Description
Test your knowledge of acids and bases, their definitions, properties, and pH scale in chemistry. Identify acidic and basic substances and their reactions.
