Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. it is also a component of cigarette smoke. pyridine ionizes in water as follows: c5h5n+h2o⇌c5h5nh++oh− the pkb of pyridine is 8.75. what is the ph of a 0.335 m solution of pyridine?

Answer : The pH of the solution is, 9.4

Solution :  Given,

Concentration (c) = 0.025 M

Base dissociation constant =

First we have to calculate the value of .

The expression used for the calculation of is,

Now put the value of in this expression, we get:

The given equilibrium reaction is,

initially conc.     0.335                    0                0

At eqm.           (0.335-x)                  x                x

Formula used :

Now put all the given values in this formula ,we get:

By solving the terms, we get:

Now we have to calculate the concentration of hydroxide ion.

Now we have to calculate the pOH.

Now we have to calculate the pH.

Therefore, the pH of the solution is, 9.4