Answer to Question #22543 in Physical Chemistry for Ylber
a) CN- + H2O ↔ HCN + OH-
b) NH4 + H2O ↔ NH3 + H3O+
a) HCN (donates a proton to H2O) is acid and H3O+ (differs from H2O by one proton) is Conjugate Acid, H2O (accepts a proton from HCN) is Base CN- (differs from HCN by one proton) is Conjugate Base.
b) NH4+ is the conjugate acid to the base NH3, because NH3 gained a hydrogen ion to form NH4+, the conjugate acid. The conjugate base of an acid is formed when the acid donates a proton. In the equation, we say that OH- is the conjugate base to the acid H2O, because H2O donates a hydrogen ion to form OH-, the conjugate base.
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