Here's a breakdown of why:
* Pyridine's basicity: Pyridine is a weak base, meaning it has a relatively low tendency to accept protons (H+). It's a heterocyclic aromatic compound with a nitrogen atom in the ring. This nitrogen atom has a lone pair of electrons that can act as a base, but it's not as readily available as the lone pairs in a simple amine.
* Water's acidity: Water is a very weak acid. While it can act as both an acid and a base, it's not strong enough to donate a proton to pyridine.
What actually happens:
When pyridine is dissolved in water, it can undergo a hydrolysis reaction. This involves the nitrogen atom in pyridine accepting a proton from a water molecule. This forms the pyridinium ion (C5H5NH+) and a hydroxide ion (OH-) However, this reaction is in equilibrium and favors the reactants.
In summary:
Pyridine doesn't directly react with water to produce hydroxide. It acts as a weak base by accepting a proton from water to form the pyridinium ion and hydroxide ion, but this reaction is limited and favors the starting materials.
