Understanding pH Scale, Acids, and Bases

What does the pH scale measure?

• The density of a solution

• The color of a solution

• Temperature of a solution

• How acidic or alkaline a solution is

What is the pH of a neutral substance like pure water?

• 7

• 4

• 14

• 0

Which of the following has a pH of around 2?

• Pure water

• Bleach

• Washing up liquid

• Stomach acid

What is the pH of bleach used to clean bathrooms?

• 9

• 12

• 2

• 4

What is a common example of a wide range indicator?

• Litmus paper

• Universal indicator

• Phenolphthalein

• Methyl orange

What ions do acids release in water?

• Hydroxide ions

• Sodium ions

• Hydrogen ions

• Chloride ions

What is a base that dissolves in water called?

• Alkali

• Neutral

• Acid

• Salt

What is produced when an acid reacts with a base?

• Hydrogen gas

• Carbon dioxide

• Oxygen gas

• Salt and water

Which of the following is a common base?

• Hydrochloric acid

• Sulfuric acid

• Sodium hydroxide

• Nitric acid

What is the pH of a solution if it is neutral?

• Exactly 7

• Greater than 7

• Between 0 and 14

• Less than 7