Target: 10 Questions in 10 minutes

An IB Chemistry data booklet is helpful

1. Which of the following graphs represents the pH curve for a weak base and a strong acid titration?

titration graphs x4 Q1
2. For the salt sodium hydrogen carbonate, what can be said for the pH of its aqueous solution?
  • A.   Less than 0
  • B.   Less than 7
  • C.   Equal to 7
  • D.   Greater than 7
3. Which of the following compounds will dissolve in water to make a solution of pH<7?
  • A.   K2SO4
  • B.   NH4OH
  • C.   NaNO2
  • D.   FeCl3

4. A weak acid is titrated with a strong base and the pH curve is shown below. What is the approximate acid dissociation constant Ka for the acid?

titration graph Q4
  • A. 9.1
  • B. 5.1
  • C. 0.0000079
  • D. 0.00000000079

5. Which of the following acid-base titrations has/have a neutral equivalence point?

I. 0.5 mol dm-3 HCl with 0.25 mol dm-3 KOH
II. 0.25 mol dm-3 H2SO4 with 0.5 mol dm-3 NaOH
III. 0.5 mol dm-3 CH3COOH with 0.25 mol dm-3 Ba(OH)2
 
  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   I, II and III
6. Which of the following equations explains the alkaline pH of sodium ethanoate solution?
  • A.   CH3COONa → CH3COO- + Na+
  • B.   CH3COO- + H+ ⇌ CH3COOH
  • C.   CH3COO- + Na+ ⇌ CH3COONa
  • D.   CH3COO- + H2O ⇌ CH3COOH + OH-

7. 20 cm3 of a 0.1 mol dm-3 ethanoic acid solution is titrated with a solution of sodium hydroxide of the same concentration. Which of the following curves correctly describes the change in pH in this titration?

titration graphs x4 Q7
8. Which of the following salts, when dissolved in water, will form an alkaline solution?
  • A.   Ammonium sulphate
  • B.   Potassium carbonate
  • C.   Copper nitrate
  • D.   Magnesium chloride
9. In a titration experiment, an excess of 0.1 mol dm-3 NaOH is added to 50 cm3 of 0.1 mol dm-3 solution of a monoprotic weak acid HA. The pH of the solution is 4.20 at the half-equivalence point of the pH curve. What is the pKa of the acid?
  • A.  1.0
  • B.  4.2
  • C.  7.0
  • D.  8.4

10. Below is a pH curve for titration between an acid HA and an alkali BOH.

titration graph Q10

Which of the following statements about the acid and the alkali is true?

I. This is a titration between a weak acid and a strong base
II. The original acid concentration is 0.001 mol dm-3
III. The pKa of the acid is 4.50
  • A.   I only
  • B.   II only
  • C.   III only
  • D.   I and III only