Understanding the pH Scale

What is the pH of a neutral solution at 25°C?

• 6

• 7

• 8

• 5

How is pH calculated from hydrogen ion concentration?

• pH = log10[H+]

• pH = 10^[H+]

• pH = -log[H+]

• pH = -log10[H+]

What is the relationship between pH and pOH?

• pH is a measure of acidity only

• pH + pOH = 14

• pH + pOH = 7

• pH is the same as pOH

If a solution has a pH of 3, what is its hydrogen ion concentration?

• 0.01 M

• 0.1 M

• 0.001 M

• 0.0001 M

What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-7 M?

• 6

• 8

• 10

• 7

How does the pH scale indicate acidity or basicity?

• A pH value of 7 indicates high acidity.

• The pH scale measures temperature and pressure.

• The pH scale ranges from 0 to 14, with 14 being neutral.

• The pH scale indicates acidity with values below 7 and basicity with values above 7.

What is the pH of a solution that is 0.01 M in hydrochloric acid (HCl)?

• 1

• 3

• 4

• 2

If the pH of a solution is increased from 5 to 7, how does the hydrogen ion concentration change?

• The hydrogen ion concentration decreases by a factor of 1000.

• The hydrogen ion concentration remains the same.

• The hydrogen ion concentration increases by a factor of 10.

• The hydrogen ion concentration decreases by a factor of 100.

What is the significance of a pH of 14 in terms of basicity?

• A pH of 14 signifies a highly basic solution.

• A pH of 14 indicates a neutral solution.

• A pH of 14 is slightly acidic.

• A pH of 14 represents a weakly basic solution.

How do buffers affect pH in a solution?

• Buffers increase the acidity of a solution.

• Buffers have no effect on pH levels.

• Buffers only work in basic solutions.

• Buffers stabilize pH in a solution by neutralizing added acids or bases.