01. Acids and Alkalis

What are acids and alkalies?

Chemical opposites

What happens when we dissolve a substance in water?

We make an aqueous solution

How do we make an aqueous solution?

We dissolve a substance in water

What can solutions be?

Acidic, alkaline or neutral

What do we add to see the pH of a solution?

Universal indicator

What does red mean?

Acidic

What does blue or purple mean?

Alkali

What does green mean?

Neutral

If the pH is less than 7 what is the solution?

Acidic

If the pH is more than 7 what is the solution?

Alkaline

If the pH is 7 what is the solution?

Neutral

What do all acids form?

H+ ions when we add them to water

What make solutions acidic?

H+ ions

What do all alkalis form?

OH- ions when added to water

What make solutions alkaline?

OH- ions

Neutralisation equation

H+ (aq) + OH- (aq) -> H2O (s)

What does H+ (aq) + OH- (aq) = H2O (s) do?

Neutralisation