Honors pH, acids, and bases

What does pH measure?

• the amount of hydrogen (H⁺) ions

• the amount of hydroxide (OH^-) ions

• amount of water

• all of the above

What is the equation for calculating pH?

• pH = [H⁺]

• pH = log [H⁺]

• pH = -log[OH^-]

• pH = -log [H⁺]

What is the unit of concentration used to express H+ concentration?

• Molality (m)

• % weight-volume (%w/v)

• Molarity (M)

• Parts per million (ppm)

Which of the following is a characteristic of a base?

• bitter

• sour

• corrosive

• releases hydrogen ions in water

A(n) ______ is a substance with a pH less than 7

• Acid
• Alkaline
• Base
• Buffer

Which of the following is a characteristic of an acid?

• bitter

• slippery

• sour

• releases hydroxide ions in water

If the [H+] of a solution is 1 x 10^-2 mol/L the pH is

• 2
• 12
• -2
• 1

A  pH and a pOH will add up to:

• 0
• 7
• 14
• 1.0 x 10^-14

If the [H+] of a solution is 6.8 x 10^-9 mol/L the pH is

• 8.17
• 8.2
• 9.99
• 8.62

When Sally tested an unknown solution, her red litmus paper turned blue, but her blue litmus paper remained blue. What does this indicate?

• unknown is acidic

• unknown is alkaline

• unknown is neutral

• unknown can be acidic, alkaline or neutral