AQA Chemistry A-level 3.1.12: Brønsted-Lowry Acids and Bases Notes
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Questions and Answers

What does the equilibrium constant Kw represent?

  • Concentration of OH- ions in an acidic solution
  • Concentration of H+ and OH- ions in a neutral solution
  • Equilibrium between H+ and OH- ions in water (correct)
  • Concentration of H+ ions in a basic solution

What is the pH value of a basic solution?

  • 14 (correct)
  • 0
  • 7
  • 10

What happens to the concentration of H+ ions in water as the temperature increases?

  • Increases (correct)
  • Decreases
  • Remains constant
  • Becomes neutral

What does a pH titration curve show?

<p>How pH of a solution changes during an acid-base reaction (D)</p> Signup and view all the answers

What is the purpose of using specific indicators in reactions?

<p>To indicate a pH change within a certain range (D)</p> Signup and view all the answers

What is the definition of a Brønsted-Lowry acid?

<p>A substance that donates protons (A)</p> Signup and view all the answers

How is acid strength defined?

<p>As a substance that only slightly dissociates in solution with pH 0-1 (A)</p> Signup and view all the answers

According to the text, what is the definition of a weak base?

<p>A base that only slightly dissociates in solution with pH 9-11 (A)</p> Signup and view all the answers

How are strong acids and strong bases defined according to the text?

<p>As substances that completely dissociate to ions in solution with pH 3-5 and 12-14 respectively (D)</p> Signup and view all the answers

What does pH measure?

<p>Concentration of H+ ions in a solution (C)</p> Signup and view all the answers

Which of the following best describes a Brønsted-Lowry acid?

<p>A substance that accepts protons (D)</p> Signup and view all the answers

What defines a strong base according to the text?

<p>A base that completely dissociates in a solution with pH 12-14 (D)</p> Signup and view all the answers

What is the main feature of a weak acid as defined in the text?

<p>It only slightly dissociates in a solution with pH 0-1 (B)</p> Signup and view all the answers

How is acid strength defined according to the text?

<p>By its interaction with protons (D)</p> Signup and view all the answers

Which of the following is true about the measurement of pH?

<p>It indicates the concentration of H+ ions in a solution on a scale from 0 to 14. (D)</p> Signup and view all the answers

What characterizes a strong acid according to the text?

<p>It completely dissociates in a solution with pH 3-5 (C)</p> Signup and view all the answers

What is the equilibrium constant for the dissociation of water at 25°C?

<p>1 x 10^-14 (D)</p> Signup and view all the answers

In an acid-base reaction, what is the significance of the neutralization point?

<p>It signifies the equivalence point. (A)</p> Signup and view all the answers

How does the pH of a weak acid-strong base reaction compare to a strong acid-strong base reaction?

<p>pH is higher in weak acid-strong base reaction. (B)</p> Signup and view all the answers

What happens to the concentration of H+ ions in water as the temperature increases?

<p>Increases (B)</p> Signup and view all the answers

What relationship allows the concentration of H+ ions to be determined if the pH is known?

<p>Equilibrium Constant (Kw) (C)</p> Signup and view all the answers

What does a pH titration curve show?

<p>Change in pH during an acid-base reaction (B)</p> Signup and view all the answers

What is the significance of the equilibrium constant (Ka) for weak acids and bases?

<p>Determines the pH of weak acids and bases (A)</p> Signup and view all the answers

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