Indicators and the pH scale

What is a pH scale?

• A ranking of solutions based on whether they're an acid or base

• A scale from 0-100

• A measure of the mass of metal in a substance

• A ranking of solutions based on whether they're a metal

This is the pH scale of which indicator?

• Methyl orange

• Universal indicator

• Litmus solution

• Red cabbage indicator

An indicator....

• Is made using vegetables

• Tests acids by changing colour in a solution

• Tests whether a substance is acidic or basic by changing colour

• Is another term for 'neutralisation'

Neutralisation is....

• Metals and carbonates cancelling each other out

• Acids and bases cancelling each other out

• A testing method used to measure pH in swimming pools

• Bubbling to indicate a gas was produced

A neutral substance has a pH of _______

• 1

• 14

• 7

• 8

A weak acid has a pH of _______

• 1

• 9

• 2

• 5

Phenolphthalein is ____________ in a basic solution

• Pink

• Clear

• Blue

• Green

A neutralisation reaction can be displayed as:

Acid + base ----> _________ + _________

• H+ ions, carbonate

• Salt, air

• Salt, water

• Water, air

Antacids treat indigestion by bringing the pH of your stomach back to ______

• 5

• 7.4

• 1.5

• 9

pH > 7= ___________

• Acidic

• Neutral

• Metallic

• Basic