1) Which of the following is not amphiprotic?
H20, NH4^+^, HSO4^-^, H2PO4^-^, all choices are amphiprotic.
I think that all of these are amphiprotic. I know for sure that H20 and H2PO4^-^ are.
2) The ion HPO4^-^ has both a conjugate base as well as a conjugate acid. The conjugate base of this ion is 1 while the conjugate acid is 2.
The question wants to know what the base and acid would be.
PO4^3-^ would be the base because you take the H away and add 1 to the exponent and the acid would be H2PO4^-^ .
Would you agree with my answers?
1) Yes, I agree with your answer. All of the choices given (H2O, NH4+, HSO4-, H2PO4-) are actually amphiprotic. H2O can act as both an acid and a base. NH4+ can act as an acid by donating a proton, and HSO4- and H2PO4- can act as bases by accepting a proton.
2) I disagree with your answer for the second question. The ion HPO4- has a conjugate base and a conjugate acid, but the base is actually HPO4^(2-), not PO4^3-. When HPO4- donates a proton, it forms the conjugate base PO4^(2-). The conjugate acid is H2PO4-, which is formed when HPO4- accepts a proton. So, the base is HPO4^(2-) and the acid is H2PO4-.
1) To determine which of the given compounds is not amphiprotic, we need to understand the concept of amphiprotic species. Amphiprotic species are substances that can act as both acids (donate a proton) and bases (accept a proton).
Let's analyze the choices:
- H2O (water): Water is amphiprotic because it can donate a proton (as H+) when it acts as an acid and accept a proton (as OH-) when it acts as a base.
- NH4+ (ammonium ion): NH4+ cannot donate a proton since it already has a positive charge. However, it can accept a proton and act as a base, making it amphiprotic.
- HSO4- (hydrogen sulfate ion): HSO4- can donate a proton (as H+) when it acts as an acid. It cannot accept a proton, so it is not amphiprotic.
- H2PO4- (dihydrogen phosphate ion): H2PO4- can donate a proton when it acts as an acid and accept a proton when it acts as a base, making it amphiprotic.
Therefore, out of the given choices, HSO4- (hydrogen sulfate ion) is NOT amphiprotic.
2) The question asks for the conjugate base and conjugate acid of the HPO4- ion.
HPO4- is a polyatomic ion where one hydrogen atom (H) is removed from H2PO4-. When a hydrogen atom is removed from an acid, it forms the conjugate base. So the conjugate base of HPO4- is PO4^3- (phosphate ion).
Since HPO4- is the conjugate base, the conjugate acid would be the species formed when it gains a proton (H+). Therefore, the conjugate acid of HPO4- would be H2PO4- (dihydrogen phosphate ion).
Your answers are correct! The base of HPO4- is PO4^3- and the acid is H2PO4-. Well done!
I agree with 2.
For #1, is NH4^+?
NH4^+ ==> NH3 + H^+ in which it donates a proton. Is that possible?
NH4^+ + H^+ ==> NH4^2+ in which it accepts a proton. Is that possible?