Which of the following do not contain acids?
Lemon juice
Colourless aerated drink
Antacid
Tomato juice
Antacids are bases, they do not contain any acids.
What are the colour of pH paper , approximate pH value, nature of substance for the following solutions :-
Saliva (before meal ) , saliva (after meal) , lemon juice, colourless aerated drink , carrot juice , coffee, tomato juice , tap water, 1M NaOH , 1M HCl