Potato juice is typically neutral or slightly acidic, so if you test it with litmus paper, blue litmus paper will remain blue, and red litmus paper will remain red. This indicates that potato juice does not change the color of either type of litmus paper, reflecting its neutral pH.
Lemon juice is an acid therefore, it turns blue litmus paper red and red litmus paper remains red
Litmus paper would turn red if apricot juice, which is acidic, was dropped on it. This is because litmus paper turns red in the presence of an acid.
The colour is not changed.
The colour remain unchanged.
Orange juice is acidic because it tastes sour and turns litmus paper red. The acidity is due to the presence of citric acid in the juice, which imparts the sour taste and causes the litmus paper to change color.
As Lemon Juice is an Acid, the colour of the Red Litmus Paper will stay the same.
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Red
When red litmus paper is dipped in grapefruit juice, it typically remains red. This is because grapefruit juice is slightly acidic, and red litmus paper does not change color in acidic conditions. If the juice were alkaline, the paper would turn blue, but grapefruit juice does not have that property.
Try it out and see what happens
As orange juice being an acidic solution, it turns blue litmus into red.
Grape juice typically has a pH ranging from 3 to 4, which is acidic. When tested with litmus paper, it would turn blue litmus paper red, indicating its acidic nature. Red litmus paper would remain red, as it does not change color in acidic solutions.
It would remain red, red litmus paper only reacts to blue in the presence of a base. Lemon juice is acidic and thus wouldn't turn the paper a color. If blue litmus paper was used in the lemon juice it would turn red. Consequently dipping blue litmus paper in a base won't change the color because it does not react with bases, only acids.
Litmus is a dye extracted from lichens, a plant. Upon addition of acid, litmus turns red whilst on addition of base, litmus turns blue. Being acidic, containing citric acid, lemon juice is expected to turn violet litmus paper red.
The litmus paper will turn red when placed in orange juice, indicating that the solution is acidic.
Blue litmus paper would turn red in orange juice.