Can someone please tell me which of the following I have wrong?? I know that one or more is incorrect, but I'm not sure which ones...
Match the following Bronsted acids with their conjugate bases.
Choices: SO42-, SO32-, CO32-, HPO42-, HPO32-, Cl-, F-, NO3-, NO2-, HSO4-, HSO3-, HCO3-, PO43-, OCN-, HS-, S2-, NH3-, CH3CO2-
A. HCN (I got CN-)
B. HS- (I got S2-)
C. HCl (I got Cl-)
D. HSO4- (I got SO42-)
E. H2SO3 (I got SO32-)
F. HNO3 (I got NO3-)
G. H2CO3 (I got CO32-)
H. NH4+ (I got NH3)
Never mind! I realized what I was doing wrong. :)
A. HCN (I got CN-)
B. HS- (I got S2-)
C. HCl (I got Cl-)
D. HSO4- (I got SO42-)
E. H2SO3 (I got SO32-) H2SO4 ==> H^+ + HSO3^- is the first ionization; therefore, HSO3^- is the conjugate base of H2SO3.
F. HNO3 (I got NO3-)
G. H2CO3 (I got CO32-) Same problem here. H2CO3 ==> H+ + HCO3^- which makes bicarbonate ion the conjugate base of carbonic acid.
H. NH4+ (I got NH3)
Check my thinking. The others look ok, at least at first glance.
Yep, that's exactly what I was doing wrong. Thanks. :)
Sure! Let's go through the list and determine the correct conjugate bases for each Bronsted acid:
A. For HCN, the conjugate base is CN-. This is correct.
B. For HS-, the conjugate base is S2-. This is correct.
C. For HCl, the conjugate base is Cl-. This is correct.
D. For HSO4-, the conjugate base is SO42-. This is correct.
E. For H2SO3, the first ionization is H2SO3 --> H+ + HSO3-. Therefore, the conjugate base is HSO3-, not SO32-. This is incorrect.
F. For HNO3, the conjugate base is NO3-. This is correct.
G. For H2CO3, the first ionization is H2CO3 --> H+ + HCO3-. Therefore, the conjugate base is HCO3-, not CO32-. This is incorrect.
H. For NH4+, the conjugate base is NH3. This is correct.
So, the corrections are:
E. H2SO3 (Conjugate base is HSO3-)
G. H2CO3 (Conjugate base is HCO3-)
I hope this helps!