SL Topic 8 : Acids and bases
For each question choose the answer you consider to be the best.
1. Which species act as Brønsted - Lowry acids in the following reactions?
NH2-(aq) + H2O(l) ⇌ NH3(aq) + OH-(aq)
CH3NH2(aq) + H2O(l) ⇌ CH3NH3+ (aq) + OH-(aq)
I.
NH3(aq)
II.
CH3NH3+ (aq)
III.
H2O(l)
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
2. Which is a Brønsted - Lowry conjugate acid/ base pair?
A. H3O+ / OHB. OH- / O2C. H2SO4 / SO42D. NH4+ / NH2-
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
1
3. In which reaction is HSO4-(aq) acting as a Brønsted - Lowry base?
A. HSO4-(aq) + NH3(aq) → SO42-(aq) + NH4+(aq)
B. HSO4-(aq) + OH-(aq) → SO42-(aq) + H2O(l)
C
HSO4-(aq) + CH3COOH(aq) → H2SO4(aq) + CH3COO-(aq)
D. HSO4-(aq) + CH3NH2(aq) → SO42-(aq) + CH3NH3+(aq)
4. Which species act as Brønsted - Lowry bases in the reaction between nitric acid and
sulfuric acid?
HNO3 + H2SO4 ⇌ H2NO3+ + HSO4A. HNO3 + H2SO4
B. H2SO4 + H2NO3+
C. HNO3 + HSO4D. H2NO3+ + HSO4-
5. Which equations represent acid-base reactions according to Lewis theory?
I.
Fe2+ + 6H2O → [Fe(H2O)6]2-
II.
BF3 + F-(aq) → BF4-
III.
2H2 + O2 → H2O
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
2
6. Which are the correct definitions of a base according to both Lewis and Brønsted - Lowry
theories?
Lewis
Brønsted – Lowry
A.
proton donor
electron pair acceptor
B.
electron pair donor
proton acceptor
C.
proton acceptor
electron pair donor
D.
electron pair acceptor
proton donor
7. Which gives an acidic solution when dissolved in water?
A. CH3COOH
B. CH3CHO
C. CH3CH2OH
D. CH3COCH3
8. Which substance reacts with dilute nitric acid to produce hydrogen gas?
A. FeCO3
B. Fe(OH)3
C. Fe2O3
D. Fe
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
3
9. Which substance will not react with hydrochloric acid to form a salt?
A. Ag
B. Zn
C. CuCO3
D. Ca(OH)2
10. Which substance is not a base?
A. CuO
B. NaCl
C. NaHCO3
D. CuCO3
11. Which list contains only strong acids?
A. HCl, HNO3, H2CO3
B. HCl, HNO3, H2SO4
C. CH3COOH, H2CO3, H2SO4
D. H2SO4, CH3COOH, H2CO3
12. Which list contains only strong bases?
A. Ba(OH)2, CH3NH2, KOH
B.
NH3, KOH, NaOH
C. Ba(OH)2, KOH, NaOH
D. NaOH, CH3NH2, NH3
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
4
13. Which statements are correct for equal volumes of solutions of carbonic acid,
H2CO3(aq), and hydrochloric acid, HCl(aq) with the same concentration?
I.
HCl is more dissociated than H2CO3.
II.
HCl will have a higher pH than H2CO3.
III.
HCl will be a better electrical conductor than H2CO3.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
14. Which can be used to distinguish between a solution of a strong monoprotic acid and a
solution of weak monoprotic acid with the same concentration?
I.
II.
III.
Add zinc to each solution and measure the rate of formation of gas produced.
Add sodium hydroxide solution to each solution and measure the temperature
change.
Measure the pH
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
5
15. Separate 1.0 mol dm-3 solutions of hydrochloric acid and ethanoic acid reacted
completely with 10.0 g of calcium carbonate to give carbon dioxide. Which is a correct
statement?
A. Both acids also gave hydrogen as a product.
B. The hydrochloric acid solution reacted faster as it has a higher pH.
C. The ethanoic acid solution gave a larger amount of gas.
D. Both solutions produced an equal amount of gas.
16. What is the correct order of increasing pH value for 1.0 mol dm-3 solutions of the four
substances?
A. HCl < CH3COOH < NH3 < KOH
B. CH3COOH < HCl < KOH < NH3
C. KOH < NH3 < CH3COOH < HCl
D. NH3 < KOH < HCl < CH3COOH
17. Which will change the pH of a solution from value of 2 to a value of 4?
A. Doubling the concentration of H+(aq).
B. Doubling the concentration of OH-(aq).
C. Decreasing the concentration of H+(aq) by a factor of 100.
D. Decreasing the concentration of OH-(aq) by a factor of 100.
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
6
18. Which compound will produce a solution with a pH greater than 7 when dissolved in
water?
A. NaCl
B. NaHSO4
C. Na2O
D. NaNO3
19. What will happen to the value of the pH of 1 cm3 of a solution of a strong base when
999 cm3 of water are added to it?
A. It will decrease by 3
B. It will increase by 3
C. It will decrease by a factor of 3
D. It will increase by a factor of 3
20. The pH of solution A is 1 and the pH of solution B is 2. Which is a correct statement?
A. [H+(aq)] in A is ten times that in B.
B. [H+(aq)] in B is ten times that in A.
C. [H+(aq)] in A is twice that in B.
D. [H+(aq)] in A is half that in B.
© Dr. Geoffrey Neuss, InThinking
www.chemistry-inthinking.co.uk
7