Acids, Bases And Salts

Question 0

Phenolphthalein

Answer 0

Colourless - acid

Pink - base

Question 1

Litmus paper

Answer 1

Red (blue-red or stays red) if acidic

Blue (red-blue or stays blue) if basic

Question 2

Methylorange

Answer 2

Orange - acid

Yellow - base

Question 3

Acid

Answer 3

An H+ ion source; donates proton(s); strong = pH 1-3 (red), weak = pH 4-6 (yellow/orange)

Question 4

Alkali/base

Answer 4

Alkali=a base capable of being soluble;

Source of OH- ions; takes in protons;