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__c__ 11. In which of the following reactions does NH3 act as Bronsted acid?
A Brønsted-Lowry acid is any species that can donate a proton (H+) to another molecule.
a. NH3(aq) + HCl (aq) NH4Cl (aq)
b. NH3 (aq) + H+ (aq) NH4+ (aq)
c. NH3 (aq) + Na (s) NaNH2 (aq) + H2 (g)
d. NH3 (aq) + H2O (l) NH4+ (aq) + OH- (aq
e. NH3(g) can never act as acid.
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Answer: c.
Explanation: In (c) Na metal deprotonates NH3 to give NH2− (amide) and H2, so NH3 donates a proton (acts as a Brønsted acid). In (a), (b) and (d) NH3 accepts a proton (acts as a base). (e) is false — NH3 can be acidic in the presence of very strong bases.
Explanation: In (c) Na metal deprotonates NH3 to give NH2− (amide) and H2, so NH3 donates a proton (acts as a Brønsted acid). In (a), (b) and (d) NH3 accepts a proton (acts as a base). (e) is false — NH3 can be acidic in the presence of very strong bases.
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