Understanding pH Scale, Acids, and Bases

What does the pH scale measure?

• The temperature of a solution

• The acidity or alkalinity of a solution

• The density of a solution

• The color of a solution

What is the pH of pure water?

• 7

• 4

• 0

• 14

Which of the following has a pH of around 2?

• Washing up liquid

• Stomach acid

• Pure water

• Bleach

What is the pH of bleach?

• 9

• 2

• 12

• 4

What is a universal indicator?

• A chemical dye that changes color depending on pH

• A type of acid

• A device to measure temperature

• A type of base

What ions do acids release in water?

• Sodium ions

• Chloride ions

• Hydrogen ions

• Hydroxide ions

What is a base that dissolves in water called?

• Acid

• Salt

• Alkali

• Neutral substance

What is produced when an acid reacts with a base?

• Hydrogen gas

• Salt and water

• Only salt

• Only water

Which of the following is a common base?

• Hydrochloric acid

• Sodium hydroxide

• Nitric acid

• Sulfuric acid

What is the benefit of using a pH probe over an indicator?

• It is more colorful

• It is cheaper

• It is easier to use

• It is more accurate and precise