Acids Bases and Salts

Amphoteric oxides

________: those that react with both an acid and an alkali to give a salt and water.

Solution

________ is heated in an evaporating dish to form soluble salt crystals.

Substances

________ that change colour when added to an acid /alkali are called indicators.

Phenolphthalein

________ is added to an alkali (soluble base)

oxides

Are the ________ and hydroxides of metals.

Excess insoluble compound

________ (metal /base /carbonate) reacts with acid whilst being heated.

soluble salt

Heat in evaporating dish to form ________ crystals.

Acid

Proton Donors/ Dissociate into H+ ions

Alkalis

(are bases that dissolve in water)

· Give solutions that contain OH

ions

The scale

pH scale

It runs from 1

14

Acidic oxides

Non-metal oxides that dissolve in water and form an acidic solution

Basic oxides

Metal oxides that dissolve in water and form basic solution

Neutral oxides

Oxides with a pH of 7

Amphoteric oxides

those that react with both an acid and an alkali to give a salt and water

Method A

Neutralization

Method B

Titration

Method C

Precipitation

Note

one soluble salt should always be a potassium or sodium solution (eg

Acid + Alkali

Acid + Alkali -> Salt + Water

Acid + Metal

Acid + Metal -> Salt + Hydrogen

Acid + metal carbonate

Acid + metal carbonate -> salt + carbon dioxide + water

Alkali + ammonium salt

Alkali + ammonium salt-> salt + ammonia + water

Result for Aluminum ions in NaOH

White soluble precipitate, turns colorless in excess

White precipitate, insoluble in excess