Physical Science: Acids & Bases

Which pH value indicates a basic solution?

• 1

• 5

• 7

• 12

If a student places a few drops of hydrochloric acid on a piece of blue litmus paper, what will happen?

• It will stay blue.

• It will turn red.

• It will turn black.

• It will turn yellow.

Tags

NGSS.MS-PS1-2

What does pH measure?

• the density of a solution

• the salt concentration of a solution

• the sulfate ion concentration of a solution

• the hydronium ion concentration of a solution

How do acids taste?

• sour

• sweet

• bitter

• salty

Tags

NGSS.MS-LS1-8

What term is used to describe a substance that changes color in response to pH?

• salt

• indicator

• electrolyte

• acid

What is the pH of a neutral solution?

• 0

• 1

• 7

• 14

Which solution will change red litmus paper to blue?

• HCl because it gives of H⁺ ions

• NaCl because it gives off Cl^- ions

• NaOH because it gives off OH^- ions

• CH₃OH because it gives off CH₃ ions

Tags

NGSS.MS-PS1-2

Which of the following is the best definition of a base?

• Bases are substances that donate protons.

• Bases are substances that accept electrons.

• Bases are any substances without hydroxide ions.

• Bases are substances that release hydroxide ions.

Select all of the following that are characteristics of a base.

• sweet

• sour

• bitter

• salty

• slippery

The table below shows the color of three indicators at different pH values. What is the pH of the unknown solution?

• 2

• 6

• 8

• 12

Tags

NGSS.MS-PS1-2