A-Level UK (AQA, Edexcel, OCR) · Chemistry

Acids, bases and redox

10 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 10 questions

  1. What is the pH of 0.0100 mol dm-3 hydrochloric acid?
  2. What is the pH of 0.0500 mol dm-3 sodium hydroxide at 298 K (Kw = 1.00 x 10^-14)?
  3. Calculate the pH of 0.10 mol dm-3 ethanoic acid (Ka = 1.8 x 10^-5 mol dm-3).
  4. A buffer contains ethanoic acid (pKa = 4.76) and sodium ethanoate with [ethanoate]/[acid] = 2. What is its pH?
  5. Which indicator is most suitable for a titration of a strong acid with a weak base?
  6. Hydrochloric acid of pH 2.00 is diluted by a factor of 10 with water. What is the new pH?
  7. What is the oxidation state of manganese in the permanganate ion, MnO4-?
  8. 25.0 cm3 of Fe2+(aq) is titrated with 0.0200 mol dm-3 KMnO4 (MnO4- + 5Fe2+ + 8H+ -> Mn2+ + 5Fe3+ + 4H2O). The titre is 20.0 cm3. What is the Fe2+ concentration?
  9. A cell is made from Zn2+/Zn (E = -0.76 V) and Cu2+/Cu (E = +0.34 V). What is the standard cell potential and which electrode is the negative terminal?
  10. Chlorine reacts with cold dilute sodium hydroxide: Cl2 + 2NaOH -> NaCl + NaClO + H2O. What type of reaction is this for chlorine?

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