Question detail
What is the equation that represents the proton transfer from a Brønsted-Lowry acid to a Brønsted-Lowry base?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Acids and bases (A-level only)
Question
- A. HA + B ⇌ A- + HB+
- B. HA ⇌ H+ + A-
- C. H2O + H+ ⇌ H3O+
- D. B + H+ ⇌ BH+
Answer
HA + B ⇌ A- + HB+
Explanation
The correct equation shows the transfer of a proton (H+) from the acid (HA) to the base (B), forming the conjugate base (A-) and the conjugate acid (HB+). This aligns with the definition of Brønsted-Lowry acids and bases.
Common mistake
Proton Transfer Equation Errors
Students often forget to balance the charges and atoms when writing equations for proton transfer, leading to incorrect representations of acid-base reactions.
To fix this, remember to write the correct chemical formulas for the acids and bases involved, ensure that the total charge and number of atoms are balanced on both sides of the equation. For example, when writing the equation for the transfer of a proton from HCl to water, start with HCl + H2O → Cl- + H3O+. Check that both sides have the same number of each type of atom and that the charges are balanced.
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