Acids and Alkalis

https://www.youtube.com/watch?v=ZWZTDiwOWiI&list=PL9IouNCPbCxXDlRtCQEG0cGehBvJ7t9Pf&index=5

What is aq

Its an aqueous solution, which means its dissolved in water. Its the symbol next to acids.

What are 3 commonly used acids.

Hydrochloric acid Hcl

Sulfuric Acid H2SO4

Nitric acid HNO3s

Whats a key fact about acids

Acids produce hydrogen ions (H+)

What are bases

Chemicals that can neutralise acids, producing a salt and water.

Bases are usually metal oxides or metal hydroxides.

What are examples of bases

Copper oxide, Iron (III) hydroxide and sodium hydroxide.

These are all bases as they can neutralise acids and produce a salt and water

What are alkalis

Bases that are soluble in water.

In aqueous solutions, alkalis produce hydroxide ions (OH-)

What does pH scale tell us

The acidity or alkalinity of a solution

Acids have a pH of 0-6.

Solutions with pH 7 are neutral.

Alkali solutions have pH 8-14.

How can we determine pH of solution

By using pH probe or universal indicator.

pH probe detects pH electronically.

Universal indicator changes colour depending on wether a solution is acid alkali or neutral.

What do different colours on universal indicator present

Green is neutral

Red is very acidic

Purple is very alkaline.

What happens when we react acid and alkaline

Hydrogen atoms come from acid, and hydroxide ions come from an alkali.

The hydroge and hydroxide ions reacft to produce water.

This is equation for neutralisation.