Pyridine $C_5H_5N$ is a colorless, water-soluble liquid with an unpleasant smell that can be extracted from coal tar. It has a $pK_b = 8.84$. a) By adding $6.52 g$ pyridine to $30.0 \;mL$ $H Cl$ $0.950\; M$, $36.4 \;mL$ of a mixture is obtained for which it is asked to calculate the $pH$. b) The previous mixture is brought to $50 mL$ with distilled water. What is the resulting pH?