. Choose pairs in which the species listed first is the conjugate base of the species listed second.
a. S2-, HS-
b. H+, OH-
c. HBr, Br-
d.
Interpretation:
Pairs in which the species listed first is the conjugate base of the species listed second should be chosen.
Concept Introduction:
The conjugate acid − base pair concept arises from the Bronsted −Lowry definition for acid and base.
According to Bronsted-Lowry model, acid is defined as a proton donor and base as a proton acceptor. On donating a proton, an acid forms conjugate base and on accepting a proton base forms a conjugate acid. Thus, in a conjugate acid-base pair, substances are in relation by accepting and donating a proton.
Reason for correct options: HS- is a weak acid and when its proton is lost it produces conjugate base S2-...
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