Indicators
An indicator is a substance, which is used to determine the end point in the process titration. In acid-base titrations, organic substance (weak acids or weak bases) are generally used as indicators. They change the color within a certain pH range. The color change and pH range of some of the common indicators are tabulated below
Table : Colour changes of indicators with pH
Indicator
|
pH range
|
Colour
|
|
Acid solution
|
Base solution
|
|
Cresol red
|
1.2 - 1.8
|
Red
|
Yellow
|
|
Thymol blue
|
1.2 - 2.8
|
Red
|
Yellow
|
|
Methyl yellow
|
2.9 - 4.0
|
Red
|
Yellow
|
|
Methyl orange
|
3.1 - 4.4
|
Pink
|
Yellow
|
|
Methyl red
|
4.2 - 6.3
|
Red
|
Yellow
|
|
Litmus
|
5.0 - 8.0
|
Red
|
Blue
|
|
Bromothymol blue
|
6.0 - 7.6
|
Yellow
|
Blue
|
|
Phenol red
|
6.4 - 8.2
|
Yellow
|
Red
|
|
Thymol blue (base)
|
8.1 - 9.6
|
Yellow
|
Blue
|
|
Phenolphthalein
|
8.3 - 10.0
|
Colourless
|
Pink
|
|
Thymolphthalein
|
8.3 - 10.5
|
Colourless
|
Blue
|
|
Alizarin yellow R
|
10.1 - 12.0
|
Blue
|
Yellow
|
|
Nitramine
|
10.8 - 13.0
|
Colourless
|
Orange, Brown
|
Email based Chemistry assignment help - homework help at Expertsmind
Are you searching chemistry expert for help with Indicators questions? Indicators topic is not easier to learn without external help? We at www.expertsmind.com offer finest service of Chemistry assignment help and chemistry homework help. Live tutors are available for 24x7 hours helping students in their Indicators related problems. We provide step by step Indicators question's answers with 100% plagiarism free content. We prepare quality content and notes for Indicators topic under chemistry theory and study material. These are avail for subscribed users and they can get advantages anytime.
Why Expertsmind for assignment help
- Higher degree holder and experienced experts network
- Punctuality and responsibility of work
- Quality solution with 100% plagiarism free answers
- Time on Delivery
- Privacy of information and details
- Excellence in solving chemistry queries in excels and word format.
- Best tutoring assistance 24x7 hours