Write the formula for the conjugate acids of---------
a) HCO3−
b) H2O
c) HPO4−2
d) NH2NH2−
e) CN−
f) PH3
a) HCO3- : The conjugate acid of HCO3- is H2CO3.
b) H2O: Water itself is amphoteric and can act as both an acid and a base, but its conjugate acid is H3O+ (hydronium ion).
c) HPO4-2: The conjugate acid of HPO4-2 is H2PO4- (dihydrogen phosphate ion).
d) NH2NH2-: The conjugate acid of NH2NH2- (hydrazine) is NH3NH2+ (hydrazinium ion).
e) CN-: The conjugate acid of CN- is HCN (hydrogen cyanide).
f) PH3: Phosphine (PH3) itself is a weak acid, but it can accept a proton to form its conjugate acid, PH4+ (tetraphosphonium ion).