Answer to Question #60117 in Physical Chemistry for joseph orobiyi

Question

4 For the following reaction, which of the following is a conjugate
acid-base pair? $H_{2}PO^{4-} (aq) + NH_{3} (aq) \rightarrow
HPO_{4}^{2-} (aq) + NH_{4}^{+} (aq)$
$H_2PO_4^-$ and $NH_3$
HPO42- and NH4+
$H_2PO_4^-$ and $HPO_4^{2-}$
None of the above



5 What is the conjugate base of $HCO_{3}^{-}$?
$CO_{3}^{2-}$
$H_{2}CO_{3}$
$HCO_{3}^{+}$
OH^{-}



6 A Brønsted-Lowry acid is defined as a substance that ______ .
acts as a proton acceptor
acts as a proton donor
increases [OH– ] when dissolved in water
decreases [H3O+] when dissolved in water



7 A substance that is capable of acting as both an acid and as a base is
_____.
Amphoteric
Diprotic
Binary acid-base
conjugated

Answer 1

4. for the reaction:
H_2 PO_4^-+NH_3→HPO_4^(2-)+NH_4^+
The acid-base conjugate pair is H_2 PO_4^- and HPO_4^(2-).
5. The conjugate base for HCO_3^- is CO_3^(2-).
6. A Brønsted-Lowry acid is defined as a substance that acts as a proton donor.
7. A substance that is capable of acting as both an acid and as a base is amphoteric.