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NSC / Matric Acids and Bases — practice questions

Explore 5 free Acids and Bases questions in NSC / Matric Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Acids and Bases questions and exercises with answers

Showing questions 1–5 of 5.

Under the Bronsted-Lowry model, what does a base do during a reaction?Read the answer and worked solution →By how much do the two members of a conjugate acid base pair differ?Read the answer and worked solution →What is the difference between a strong acid and a concentrated acid?Read the answer and worked solution →Which indicator is preferred for the titration of a weak acid with a strong base?Read the answer and worked solution →50 cm cubed of 0.10 mol per dm cubed hydrochloric acid is diluted with water to a total volume of 500 cm cubed. What is the pH of the diluted solution?Read the answer and worked solution →

Worked practice questions

Under the Bronsted-Lowry model, what does a base do during a reaction?

  1. It donates protons
  2. It accepts electrons
  3. It donates electrons
  4. It accepts protons
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Correct answer: D. It accepts protons

1. A hydrogen atom that has lost its electron is a bare proton. 2. The Bronsted-Lowry model sorts substances by what they do with that proton. 3. An acid gives a proton away, so it is a proton donor. 4. A base takes a proton, so it is a proton acceptor. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 9: Acids and bases_

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By how much do the two members of a conjugate acid base pair differ?

  1. By one hydrogen ion
  2. By one whole electron
  3. By one oxygen atom
  4. By two hydrogen ions
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Correct answer: A. By one hydrogen ion

1. Look at the forward and the reverse reaction of the same reversible equation. 2. An acid gives away a proton in the forward direction, leaving a species that can take one back. 3. That pair of species differs by exactly one hydrogen ion and by one unit of charge. 4. The species left after the acid loses its proton is the conjugate base of that acid. 5. Two hydrogen ions would take a diprotic acid two steps, which is not what a single pair describes. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 9: Acids and bases_

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What is the difference between a strong acid and a concentrated acid?

  1. Strong describes how much was added
  2. Strong describes how far it ionises
  3. Strong describes how hot it must be
  4. Strong describes how it tastes
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Correct answer: B. Strong describes how far it ionises

1. Strong and weak describe how completely an acid ionises when it is put into water. 2. A strong acid ionises almost completely, a weak acid only ionises to a small extent. 3. Concentrated and dilute describe how much acid was added to the solvent. 4. So a strong acid can be prepared as a dilute solution, and a weak acid can be concentrated. 5. Confusing the two is the usual mistake, which is why the amount added is the wrong answer here. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 9: Acids and bases_

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