For each of the subsequent reactions identify the Bronstead-Lowry acid, base and their conjugate base and acid
a.) H2PO4-(aq) + H2O (l) <---> H3O+ (aq) HPO4^2- (aq)
b.) CH3NH2(aq) + H2O (l) <----> CH2NH3+ (aq) + OH- (aq)
c.) NH3(l) + CH2O- <-----> NH2-(l) + CH2OH (aq)