im pretty sure grapefruit is an acid, so it would turn litmus paper red.
the red litmus paper turns to blue
Red color in acidic solutions and blue color in basic solutions.
the litmus paper turns red when in contact with phosphoric acid
Ammonia turns red litmus paper blue, but does not have any effect on blue litmus parer, since it is a base.
It turns red litmus paper to blue.
If it is blue litmus paper ,then it turns red. But if its red litmus paper, it doesn't change color.
Blue litmus paper turns red in acid red litmus paper turns blue in alkali.
the red litmus paper turns to blue
an acid turns the litmus paper red.
The litmus paper will turn red.
Blue
turns blue litmus paper red
Litmus paper turns blue in basic solution.
When an acid touches Litmus paper it turns red (pink).
The color is blue.
this is very easy to understand if u place red litmus paper in a acid it turns red/pink. if u place red litmus paper in a base it turns blue. blue litmus paper in a acid turns pink/red. blue litmus paper in a base stays blue.
Litmus paper is basically used to test nature of solution i.e acid or alkaline. For acid blue litmus turns to red. But for alkaline red litmus turns to blue color.