pH indicators and acids/bases

How do you call the reaction that separates water in hydrogen and hydroxide ions?

• condensation

• dissociation

• combustion

• neutralisation

If an acid has a pH of 1, it is called ... acidic

• weakly

• strongly

• alkaline

• super

NaOH is...

• a base

• an acid

• a covalent compound

• a chemical that doesn't dissolve in water

Which one is NOT a pH indicator?

• phenolphtalein

• methyl orange

• blue litmus

• hydrochloric acid

Red litmus paper is red when the pH is...

• below 5

• above 8

• between 5 and 8

• 7

methyl orange is yellow when the pH is...

• acidic

• alkaline

• at 5

• never

The advantage of a universal indicator is...

• that it has pretty colors

• it can give a more accurate measurement of the pH than phenolphtalein

• it is a paper

• it is universal

Phenolphalein is pink when the pH is

• above 10

• below 5

• at 7

• below 1

An acid is a substance that acts as a source of...

• H+ ions

• OH- ions

• water

• pH

The reaction of acid and base is called...

• neutralisation reaction

• condensation reaction

• dissociation

• polymerization