Self assessment
Question 1 of 7
Which statements are true about the reaction of an acid and a base?
A
An acid base reaction can be the transfer of a proton
B
An acid base reaction can be the transfer of an electron pair
C
An acid releases a proton to leave its conjugate acid
D
Water is essential for an acid base reaction to take place
The pH of a salt is determined by the strength of acid and base of which it is made. Which of the following statements is not true?
A
The pH of a salt of a weak acid and a strong base is greater than 7
B
The pH of a salt of a weak acid and a weak base is pH7
C
The pH of a salt of a strong acid and a weak base is less than 7.
D
The pH of a salt of a strong acid and a strong base is pH7
A teacher asked her students (who have already studied Brønsted Lowry theory) 'which of the following equations best describes the reaction between dilute potassium hydroxide and hydrochloric acid?' Many chose the wrong answers. Which is the answer that she hoped her class would give?
A
K+ + Cl– KCl
B
K+ + OH– + Cl– + H+ KCl + H2O
C
H+ + OH– H2O
D
K+ + OH– + Cl– + H+ KOH + H2O
The pH of the salt formed from a weak base and a weak acid depends on the relative strengths of acid and base, ie the extent to which H+ ions and OH– ions are removed from solution. Which statements summarise the relationship of Kb, Ka and pH?
A
Kb is less than Ka, pH greater than 7
B
Kb is less than Ka, pH is less than 7.
C
Kb is greater than Ka, pH is greater than 7.
D
Kb = Ka, pH = 7
Consider the reaction: HSO3–(aq) + H2O(l) SO32-(aq) + H3O+(aq)
Which option shows the correct choices of Brønsted Lowry acid and conjugate base, and Brønsted Lowry base and conjugate acid, in that order?
A
HSO3– and SO32–; H2O and H3O+
B
H2O and H3O+ ; HSO3– and SO32–;
C
HSO3– and H3O+; SO32– and H2O
D
SO32– and H2O; HSO3– and H3O+;
The reaction between nitric acid and sulfuric acid can be written as
H2SO4 + HNO3 H2NO3+ + HSO4–
According to Bronsted Lowry theory, which species are acting as acids?
A
H2SO4 and HNO3
B
H2NO3+ andHSO4
C
HNO3 and H2NO3+
D
H2SO4 and H2NO3+
Which of the following equations represents an acid‐base reaction according to Lewis theory but not according to Bronsted Lowry definition?
A
NiCl2 + 6H2O [Ni (H2O)6]2+ + 2Cl–
B
NH3 + HCl NH4Cl
C
KOH + HCl KCl + H2O
D
CO32– + 2H+ H2O + CO2