Calculating pH and Percent Ionization of Weak Acids and Bases

This video tutorial covers the calculation of pH for weak acid and base solutions, including the concepts of percent ionization and equilibrium constants (Ka and Kb). It explains the dissociation of strong acids and bases, the relationship between pH and pOH, and how to use ICE tables for equilibrium calculations. The video also discusses acid strength, the relationship between Ka and pKa, and provides practice problems to reinforce these concepts.

What is the pH value when the pOH is 10 at 25 degrees Celsius?

• pH = 14

• pH = 4

• pH = 10

• pH = 6

Which constant is used to describe the equilibrium of a weak acid in water?

• Ka

• Kc

• Kb

• Kw

What is the value of Kw at 25 degrees Celsius?

• 1 x 10^-5

• 1 x 10^-14

• 1 x 10^-7

• 1 x 10^-10

What does the pKa value represent in acid-base chemistry?

• The product of pH and pOH

• The negative logarithm of the acid dissociation constant

• The base dissociation constant

• The hydrogen ion concentration

How is percent ionization calculated for a weak acid?

• Concentration of ionized acid divided by initial concentration times 100%

• Concentration of H+ ions times initial concentration

• Concentration of OH- ions divided by initial concentration

• Initial concentration divided by concentration of ionized acid

What is the pH of a 0.75 M acetic acid solution given Ka = 1.8 x 10^-5?

• pH = 3.67

• pH = 2.43

• pH = 4.75

• pH = 1.80

How do you find the pH of a solution from the hydroxide ion concentration?

• pH = pOH + 7

• pH = pOH - 14

• pH = 14 - pOH

• pH = 14 + pOH

What is the correct expression for calculating Ka from Kb?

• Ka = Kb / Kw

• Ka = Kw + Kb

• Ka = Kb * Kw

• Ka = Kw / Kb

What is the pH of a 0.4 M ammonium chloride solution, given Kb of NH3 is 1.8 x 10^-5?

• pH = 4.83

• pH = 5.56

• pH = 7.00

• pH = 9.21

What is the pH of a 1.5 M sodium fluoride solution, given Ka of HF is 7.2 x 10^-4?

• pH = 8.66

• pH = 7.20

• pH = 5.34

• pH = 9.00