5 - Formulae, Equations and Amounts of Substance

Question 1

Describe the colour changes seen for methyl orange:

Answer 1

red in acid, yellow in alkali

Question 1

Describe the colour changes of phenolphthalein:

Answer 1

colourless in acid, pink in alkali

Question 2

This apparatus is used to test for the combustion products (CO₂ + H₂O) of water gas - explain how it should be fixed:

Answer 2

place the U-tube before the limewater