Acids and alkalis are made safer by diluting with water.
Acids are not safe enough to be used in food preparations because they are too sour tasting.
Antacids in indigestion mixtures are weak acids.
Sodium hydrogen carbonate
Very strong alkali
Very weak acid
Blue litmus turns red in bleach
Blue litmus turns red in lemon juice
Red litmus turns blue in bleach
Carbon dioxide + water
Salt + water + carbon dioxide
Salt + hydrogen
The gas is bubbled into limewater
Damp blue litmus is placed in the gas
A glowing wooden splint is placed in the gas
Oven cleaner (ammonia solution)
Battery acid (sulphuric acid)