Acids, Bases, and pH Scale

Organize the following properties.

Groups:

(a) Acids

,

(b) Bases

,

(c) Both Acids and Bases

• Formulas contain OH^- and HCO₃^-

• Described as alkaline

• Feel slippery

• Release hydroxide ions

• High pH value

• Bitter-tasting

• Formulas begin with H

• Water-soluble

• Good conductors of electricity

• Sour-tasting

• Release hydrogen ions

• Low pH value

What does the term "alkaline" refer to?

• A solution with a pH less than 7.

• A solution with a pH equal to 7.

• A solution with a pH greater than 7.

• A solution with a pH of exactly 0.

What is the pH scale?

• A scale that measures the temperature of a solution.

• A scale that measures the acidity or basicity of a solution.

• A scale that measures the density of a solution.

• A scale that measures the colour intensity of a solution.

What does the pH scale represent?

• The concentration of water molecules in a solution.

• The concentration of hydrogen ions (H⁺) in a solution.

• The concentration of oxygen ions (O^2-) in a solution.

• The concentration of hydroxide ions (OH^-) in a solution.

What does it mean that the pH scale is a logarithmic scale?

• Each unit change on the pH scale represents a tenfold change in hydrogen ion concentration.

• Each unit change on the pH scale represents a twofold change in hydrogen ion concentration.

• Each unit change on the pH scale represents a hundredfold change in hydrogen ion concentration.

• Each unit change on the pH scale represents no change in hydrogen ion concentration.

Which of the following pH values indicates a neutral solution?

• pH 0

• pH 7

• pH 14

• pH 10

Which of the following pH values indicates an acidic solution?

• pH 2

• pH 7

• pH 14

• pH 10

Which of the following pH values indicates a basic solution?

• pH 2

• pH 7

• pH 10

A solution with a pH of 13 is ___ times more basic than a solution with a pH of 11.

• 1

• 10

• 100

• 1000

A solution with a pH of 3 is ___ times more acidic than a solution with a pH of 6.

• 1

• 10

• 100

• 1000