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WorksheetsAcid Strength Molecular Structure
Total questions: 20
Worksheet time: 27mins
Which of the following best approximates the Ka value for this weak acid?
1 x 10–3
1 x 10–4
1 x 10–5
1 x 10–6
Which of the following best represents a solution of H2SO4 in water?
HSO4¯ + H2O ↔ H3O+ + SO4 2¯ In the equilibrium represented above, the species that act as bases include which of the following?
HSO4-
H2O
SO4 2¯
H2O and SO4 2¯
Given the equation:
H2SO4 + H2O ↔ H3O+ + HSO4- 1
What is the conjugate acid?
H2SO4
H2O
H3O+
HSO4- 1
Which compound is the conjugate base?
HCO3- + HCl ==> H2CO3 + Cl-
Which compound is the conjugate base?
HCO3-
HCl
H2CO3
Cl-
Which of the following is transferred between a conjugate acid-base pair?
an electron
a proton
a neutron
a OH- ion
When a hydrogen ion is lost from an acid, the resulting particle is called its conjugate base. Which of the following particles would be the conjugate base for the acid HSO4–?
H2SO4
SO42–
SO4–
HSO4
Ethanoic acid is a weak acid because it
does not contain any hydrogen ions
has a very low pH
is used in cooking and flavouring food
is not fully ionised in water to form many hydrogen ions
What is the conjugate base of HCO3-?
HCO3-
H2CO3-
CO32-
H2CO3
Which donates protons?
Brønsted-Lowry Acids
Brønsted-Lowry Bases
Arrhenius Acids
Arrhenius Bases
Which of the following represents the chemical formula for hydronium?
H2O
H+
H3O+
OH-
When citric acid is produced by the cells of an orange and dissolves in water, it produces a relatively small number of hydronium ions. Citric acid is best described as a
concentrated acid.
weak acid
dilute acid.
strong acid.
Which of these Ka values corresponds to the strongest acid?
4 x 10-4
6 x 10-4
5 x 10-4
7 x 10-4
Which of the following shows the correct conjugate acid base pair?
H2O (base) / H3O+ (conjugate acid)
H2O (acid) / CH3COO- (conjugate base)
CH3COOH (acid) / H3O+ (conjugate base)
CH3COOH (base) / CH3COO- (conjugate acid)
Which of these is a weak base?
HBr
NH3
KOH
CH3COOH
Hydrochloric acid (HCl) and acetic acid (HC2H3O2) are both acids. HCl completely dissociates in water, while HC2H3O2 does not. Which of the following statements best describes these two acids?o;'
HCl is a weak acid, HC2H3O2 is a weak acid.
HCl is a strong acid, HC2H3O2 is a weak acid.
HCl is a strong acid, HC2H3O2 is a strong acid.
HCl is a weak acid, HC2H3O2 is a strong acid.
Which of the following best approximates the Ka value for this weak acid?
1 x 10–3
1 x 10–5
1 x 10–4
1 x 10–6
HA, a weak acid, is partially dissociated in water into hydrogen ions and A- . Which of the following equation represents dissociation of HA, a weak acid, in water?
HA(aq) ⇌ H- (aq) + A+ (aq)
HA(aq) ⇌ H+ (aq) + A- (aq)
H- (aq) + A+ (aq) ⇌ HA(aq)
H+ (aq) + A- (aq) ⇌ HA(aq)
Pyridine is a weak base with the formula C5H5N. Pyridine reacts with water according to the following equation: C5H5N + H2O → C5H5NH+ + OH–. What is the formula for the ionisation constant for this base?
Kb= [C5H5N]/[OH– ][CO2H– ]
Kb = [H+][CO2H– ]/[C5H5N]
Kb= [C5H5N][CO2H– ]/[OH– ]
Kb = [OH– ][C5H5NH+]/[C5H5N]
A strong base is defined as a substance which
donates protons very strongly.
form many hydronium ions.
dissociates almost completely.
