Ok so for question I have to state whether the element/compound is an acid, base, conjugate acid or conjugate base. Can u please tell me if i am correct and help me out with the ones i am unsure what the answer is?
1)S^2-(aq)+HCl(aq)<=>Cl^1-(aq)+HS^1-(aq)
This is what I think the answer is:
Acid = HCl
Base = S^2-
Conjugate acid =Cl^1
Conjugate base = HS^1-
2)H2O2(aq)+PO4^3-(aq)<=>HPO4^2-(aq)+ HO2^1-(aq)
This is what I think it is:
Acid = H2O2
Base = PO4^3-
Conjugate acid =unsure
Conjugate base = unsure
3)IO3^1-(aq)+HI(aq)<=>I^1-(aq)+HIO3(aq)
This is what I think it is:
Acid = HI
Base = IO3
Conjugate acid =HIO3
Conjugate base = I^1-
4)H2SO4(aq)+CN^1-(aq)<=>HSO4^1-(aq)+ HCN(aq)
This is what I think it is:
Acid = H2SO4
Base = CN^1-
Conjugate acid =unsure
Conjugate base = unsure
Some right, some wrong. Here is the way you do it.
Example, your #4.
H2SO4 + CN^- <==>HSO4^- + HCN
You apparently have no trouble determining which is the acid and which is the base. All of them above are correct. Your problem is knowing what is the conjugate acid/base.
H2SO4 is the acid; therefore, what it goes to is the conjugate base which makes HSO4^- the conj base.
CN^- is the base; what it changes to is the conjugate acid. That is HCN
1) Your answers for question 1 are correct:
Acid = HCl
Base = S^2-
Conjugate acid = Cl^1-
Conjugate base = HS^1-
2) In question 2:
Acid = H2O2
Base = PO4^3-
Conjugate acid = HPO4^2-
Conjugate base = HO2^1-
3) In question 3:
Acid = HI
Base = IO3^1-
Conjugate acid = HIO3
Conjugate base = I^1-
4) In question 4:
Acid = H2SO4
Base = CN^1-
Conjugate acid = HSO4^1-
Conjugate base = HCN
To determine whether a species is an acid or base, look at the reaction equation and identify which species donates or accepts a proton (H+). The species that donates a proton is an acid, while the species that accepts a proton is a base.
To determine the conjugate acid-base pairs, look at the species on either side of the reaction equation. The conjugate acid of a base is the species that it forms when it accepts a proton, while the conjugate base of an acid is the species that it forms when it donates a proton.