A student perpared solution of a acids and a base in two separate breakers she forgot to label the solution and litmus paper is not available in the lab , since both the solution are colours less how will she distinguish the two
A student perpared solution of a acids and a base in two separate breakers she forgot to label the solution and litmus paper is not available in the lab , since both the solution are colours less how will she distinguish the two
In the absence of litmus, other natural or synthetic substances can be used to test acid and bases. Such substances are called Indicators. Indicators such as methyl orange and phenolphthalein can be used to test the nature of a solution. These indicators show change in their colour in acidic, neutral and basic solutions. We can also use natural indicators such as turmeric and grape juice.
A few indicators with characteristic colour change are shown below.
S. No
Indicator
Colour in acidic solution
Colour in neutral solution
Colour in basic solution
1.
Litmus
Red
Purple
Blue
2.
Phenolphthalein
Colourless
Colourless
Pink
3.
Methyl orange
Red/Pink
Orange
Yellow
4.
Turmeric juice
Yellow
Yellow
Reddish brown
In the absence of litmus, other natural or synthetic substances can be used to test acid and bases. Such substances are called Indicators. Indicators such as methyl orange and phenolphthalein can be used to test the nature of a solution. These indicators show change in their colour in acidic, neutral and basic solutions. We can also use natural indicators such as turmeric and grape juice.
A few indicators with characteristic colour change are shown below.
| S. No | Indicator | Colour in acidic solution | Colour in neutral solution | Colour in basic solution |
| 1. | Litmus | Red | Purple | Blue |
| 2. | Phenolphthalein | Colourless | Colourless | Pink |
| 3. | Methyl orange | Red/Pink | Orange | Yellow |
| 4. | Turmeric juice | Yellow | Yellow | Reddish brown |
