11 mark
H3NSO3 (aq) + 2NH3 (aq) ⇌ HNSO32- (aq) + 2NH4+ (aq)
For the equilibrium equation shown, which species are Brønsted-Lowry acids?
NH4+ and NH3
NH4+ and HNSO32-
H3NSO3 and HNSO32-
H3NSO3 and NH4+
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Brønsted-Lowry Acids & Bases (College Board AP® Chemistry)
Exam Questions
8 mins8 questions21 mark
H2PO4− (aq) + CN- (aq) ⇌ HCN (aq) + HPO42− (aq)
What is the conjugate acid in the reaction above?
HCN
CN-
H2PO4−
HPO42−
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31 mark
H3PO4 (aq) + H2O (l) ⇌ H2PO4- (aq) + H3O+ (aq)
Consider the reaction above. Which of the following statements is true?
H3PO4 and H2PO4- is a base and conjugate acid pair.
H2PO4- is a weak base.
H2O is acting as Brønsted-Lowry acid.
H3O+ is the conjugate base of H2O.
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41 mark
H2SO4 + HNO3 ⇋ H2NO3+ + HSO4-
The reaction above occurs between concentrated sulfuric and nitric acids.
Identify the two species which are acting as Brønsted–Lowry bases.
H2NO3+ and HSO4-
HNO3 and H2NO3+
H2SO4 and HSO4-
HNO3 and HSO4-
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11 mark
H2O (l) + F- (aq) ⇌ HF (aq) + OH- (aq)
H2O (l) + HNO3 (aq) → H3O+ (aq) + NO3- (aq)
H2O (l) + CO2 (g) ⇌ H2CO3 (aq)
H2O (aq) + NH3 (aq) ⇌ NH4OH (aq)
Consider the reactions above.
Which of the following statements is true?
H2O is shown acting as a Bronsted-Lowry acid only.
NO3- is a strong base.
H2O acts as a Bronsted-Lowry acid twice.
F- and HF are an acid and conjugate base pair.
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21 mark
Potassium hydrogenphosphate has the formula K2HPO4 .
What is the conjugate base of this compound?
H2PO4-
KHPO42-
PO43-
KH2PO4
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31 mark
Which of the following is the conjugate base of carbonic acid (H2CO3)?
CO32-
OH-
H3CO3+
HCO3-
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41 mark
HBrO (aq) + H2O (l) ⇌ BrO- (aq) + H3O+ (aq)
Which one of the following statements is true about the reaction above?
HBrO is the conjugate base of BrO-
H3O+ is the conjugate acid of H2O
BrO- is the conjugate acid of HBrO
There are no conjugate acid-base pairs in the equilibrium
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