QCEVault

Acids, bases and titration — Question 14

QCAA 2021, Paper 1 · 1 mark

Q14 · 2021 · Paper 1Unclassified1 mark

QUESTION 14

Acid

Ka value

Nitrous acid

Ka= 4.00 × 10–4

Ethanoic acid

Ka= 1.76 × 10–5

Hydrofluoric acid

Ka= 7.20 × 10–4

Chloroethanoic acid

Ka= 1.40 × 10–3

Analyse the data to determine the relative strengths of acids from strongest to weakest.

(A) chloroethanoic, ethanoic, nitrous, hydrofluoric

(B) chloroethanoic, hydrofluoric, nitrous, ethanoic

(C) ethanoic, nitrous, hydrofluoric, chloroethanoic

(D) ethanoic, hydrofluoric, nitrous, chloroethanoic

Question linkQCAA assessment resources

Related questions

  1. Q3 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 3 Identify the amphiprotic species. +(aq) (A) NH4 (B) H3O+(aq) 2−(aq) (C) CO3 −(aq) (D) HCO3
    Acids, bases and titration
  2. Q5 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 5 A 25.00 mL aliquot of aqueous potassium hydroxide (KOH) solution was titrated against an aqueous solution of 0.100 M hydrochloric acid (HCl). It took 17.45 mL of HCl to reach the equivalence point. Determine the concentration of the KOH(aq) solution. (A) 2.29 × 10−1 M (B) 1.43 × 10−1 M (C) 6.98 × 10−2 M (D) 4.36 × 10−5 M
    Acids, bases and titration
  3. Q8 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 8 Which is the most concentrated weak base? (A) 2.0 M KOH(aq) (B) 0.2 M NaOH(aq) (C) 2.0 M NH4OH(aq) (D) 0.2 M Al(OH)3(aq)
    Acids, bases and titration
  4. Q14 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 14 Increasing the pH of an aqueous solution of hydrochloric acid (HCl) from 2 to 4 (A) reduces the strength of the acid. (B) increases the acidity of the solution. (C) increases the concentration of H+ ions by a factor of 2. (D) reduces the concentration of H+ ions by a factor of 100.
    Acids, bases and titration