15 Questions
According to the Arrhenius definition, what is a weak base?
A substance that slightly dissociates in water to give OH- ions
Which theory of acids and bases expanded the scope beyond solutions dissolved in water?
Bronsted – Lowry Theory
What is the term used to describe a substance that can act as both an acid and a base?
Amphiprotic
Which type of acids dissociate to give two H+ ions in aqueous solution?
Dibasic acids
What is the characteristic of strong acids in terms of dissociation in water?
They fully dissociate in water
Why do H+ ions bond with a water molecule to form a hydronium ion in water?
H+ ions cannot exist on their own in water
What must HC2O4- do to change into its conjugate base?
Donate a proton
Which substance is formed when the hydrogen ion from an acid is replaced by a metal or ammonium ion?
Salt
What is the purpose of adding limestone to lakes in areas suffering from acid rain?
To neutralise acidity
According to the Bronsted-Lowry theory, a weak acid is characterized as __________.
A poor proton donor
Which of the following statements is true regarding the Arrhenius Theory and the Bronsted-Lowry Theory?
Arrhenius Theory is limited to reactions in water, while Bronsted-Lowry Theory is not limited to reactions in water.
In a conjugate acid-base pair according to the text, what defines the relationship between the acid and the base?
They differ by one proton.
According to the Brønsted-Lowry theory, how do strong acids differ from weak acids?
Strong acids are good proton donors, while weak acids are poor proton donors.
Identify the conjugate base of the weak acid HA and explain why it is weaker than the conjugate base of sulfuric acid.
A- is the conjugate base of HA and weaker because it is less stable.
Why is the conjugate base of sulfuric acid, HSO4-, considered an acid itself? Provide a balanced equation for its dissociation in water.
HSO4- can donate a proton to water, forming H3O+, making it an acid.
Test your knowledge on the definitions of strong and weak acids and bases based on Bronston-Lowry theory. Compare the limitations and differences between Arrhenius theory and Bronsted-Lowry theory.
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