Because of science. Or god. You decide.
The water should stay the same colour if you are using litmus paper, but if you are using a liquid the colour should change. The colour purely depends on the acidity/alkalinity of the water you are putting it in. Yellows are alkaline, Greens are neutral and Blues are acidic (it may be the other way around.. yellow being acid, blue being alki.) The measure of acidity is pH.
Bases and alkali's turn litmus paper purple.
Blue litmus paper stays blue in a neutral solution. It turns red only when in an acidic solution. Similarly, red litmus paper would stay red in a neutral solution and turn blue in an alkaline solution. Added: acidic: pH below 5.5 it turns (stays) red alkaline: pH above 8.0 it turns (stays) blue neutral, in between 5.5 and 8.0: its color is purple, between 'red and blue' or 'blue and red' A much better indicator paper is universal indicator paper. It is yellow and can tell you the exact pH of the solution it is dipped in, going yellow to red in acidic conditions, blue to purple in alkaline conditions and green in neutral conditions. The exact colour depends on the pH.
the liquid is neutral
Lithmus will give a red color when added to acidified water or it will turn to red when neutral water is acidified.Remember:Litmus turnsBlue in BasicreD in aciD
Red, and an alikili goes blue.
Water(H2O)
If you add red litmus paper and it remains red, then you add blue litmus paper and it remains blue, then the the solution is neutral. Kamal
Acids add protons or H+ (they're the same thing) to water solutions. That's the definition of an acid.
You can test whether a substance is an acid or a base using litmus paper. When dipped in the substance, blue litmus paper turns red in the presence of an acid, while red litmus paper turns blue in the presence of a base.
it doesnt If you add the boiled blue water to vinegar it does turn red add it to water mixed with baking soda it turns green. I did it just cut the cabbage into small pices before boiling. It is showing you if it is acid or akalis
1. Dip litmus into water to identify the pH 2. Add an alkali of the same strength