pH and pOH Concepts

The video tutorial explains how to calculate the pH of a 0.001 molar solution of sodium hydroxide. It begins by discussing the nature of sodium hydroxide and its dissociation into sodium and hydroxide ions. Since the solution contains hydroxide ions, the pOH is calculated using the negative logarithm of the hydroxide ion concentration. The pOH is found to be 3, and using the relationship between pH and pOH (pH + pOH = 14), the pH is determined to be 11. This confirms that the solution is basic, as expected for sodium hydroxide.

What is the charge of the hydroxide ion in a sodium hydroxide solution?

• Positive

• Variable

• Negative

• Neutral

Why can't the pH formula be used directly for sodium hydroxide?

• Because sodium hydroxide is not soluble in water

• Because sodium hydroxide is a solid

• Because sodium hydroxide does not contain hydrogen ions

• Because sodium hydroxide is not an acid

What is the formula used to calculate pOH?

• pOH = -log[H+]

• pOH = -log[OH-]

• pOH = log[OH-]

• pOH = log[H+]

What is the pOH of a 0.001 molar solution of sodium hydroxide?

• 1

• 2

• 3

• 4

What is the relationship between pH and pOH?

• pH + pOH = 14

• pH + pOH = 7

• pH + pOH = 0

• pH + pOH = 1

If the pOH of a solution is 3, what is the pH?

• 11

• 10

• 9

• 8

Why should the pH of a sodium hydroxide solution be greater than 7?

• Because it is a salt

• Because it is neutral

• Because it is a base

• Because it is an acid

What is the final pH of the 0.001 molar sodium hydroxide solution?

• 14

• 11

• 10

• 7