Lichens Flashcards
Litmus solution is a purple dye, which is extracted from lichen, a plant belonging to the division Thallophyta, and is commonly used as an indicator. When the litmus solution is neither acidic nor basic, its colour is purple. There are many other natural materials like red cabbage leaves, turmeric, coloured petals of some flowers such as Hydrangea, Petunia and Geranium, which indicate the presence of acid or base in a solution. These are called acid-base indicators or sometimes simply indicators (7 cards)
1
Q
What is litmus solution?
A
A purple dye extracted from lichen, used as an indicator.
2
Q
What color is litmus solution when it is neither acidic nor basic?
A
Purple.
3
Q
What division does lichen belong to?
A
Thallophyta.
4
Q
Name some natural materials that indicate the presence of acid or base.
A
- Red cabbage leaves
- Turmeric
- Coloured petals of flowers such as Hydrangea, Petunia, and Geranium.
5
Q
What are acid-base indicators?
A
Natural materials that indicate the presence of acid or base in a solution.
6
Q
True or False: Litmus solution is only used in laboratory settings.
A
False.
7
Q
Fill in the blank: When litmus solution is acidic, its color changes from _______.
A
[purple].
