Acids and Alkalis - Indicators

Which of the following is true of an acid?

• It has a pH value of 7.

• It turns red litmus paper blue.

• It turns blue litmus paper red.

• It has a pH value of more than 7.

Litmus paper can be used to determine the pH value of a solution.

• True

• False

All acids have a pH higher than 7.

• True

• False

Distilled water has a pH of 7.

• True

• False

When a Universal Indicator is added to sulphuric acid, the solution turns red.

• True

• False

When a Universal Indicator is added to a solution of potassium hydroxide, the solution turns blue.

• True

• False

Tags

NGSS.MS-PS1-2

When acids and alkalis react, salts of neutral pH are formed.

• True

• False

Toothpaste can neutralise the acids produced by bacteria feeding on the food stuck on our teeth.

• True

• False

Tags

NGSS.MS-PS1-2

Study the table provided.

Which substance(s) will turn blue litmus paper red?

• S

• S and T

• S and U

• T and U

Tags

NGSS.MS-PS1-2

Study the table provided.

What gas is produced when magnesium is added to substance S?

• Helium

• Oxygen

• Hydrogen

• Carbon Dioxide

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5