Pyridine Ionization and pH Calculations

The video tutorial explains how to find the pH of pyridine by first writing the ionization reaction and the corresponding KB expression. It then demonstrates setting up an ICE chart to determine the equilibrium concentrations. By assuming X is negligible, the tutorial simplifies the equation to solve for X, which represents the concentration of OH-. Finally, it calculates the pH by finding the POH and subtracting it from 14.

What is the product formed when pyridine reacts with water?

• C5H5NH2 and H+

• C5H5N and H2O

• C5H5NH+ and OH-

• C5H5N and OH-

What does the KB expression for pyridine's ionization include?

• Concentration of C5H5N and OH-

• Concentration of C5H5NH2 and H+

• Concentration of C5H5N and H2O

• Concentration of C5H5NH+ and OH- over C5H5N

In the ICE chart, what is the initial concentration of pyridine?

• 0.25

• 0.15

• 0.10

• 0.21

How is the change in concentration represented in the ICE chart for pyridine?

• Minus X for pyridine, plus X for ions

• No change for pyridine, plus X for ions

• Plus X for pyridine, minus X for ions

• Minus X for pyridine, no change for ions

What assumption is made to simplify the calculation of X in the KB expression?

• X is equal to 1

• X is greater than 0.21

• X is equal to 0.21

• X is much less than 0.21

How do you calculate the pH from the POH?

• Subtract POH from 14

• Divide POH by 14

• Add POH to 14

• Multiply POH by 14