دهکده - آموزش شیمی

Methyl violet

0.1
yellow

2.7
violet

0.05% water

Cresol red

0.2
red

1.8
yellow

0.1% water

Thymol blue

1.2
red

2.8
yellow

0.05% water

2,4-Dinitro phenol

2.8
colourless

4.7
yellow

0.1% ethanol

Congo red

3.0
blue

5.2
yellow/orange

0.1% water

Methyl orange

3.1
red

4.4
yellow/orange

0.1% water

Bromocresol green

3.8
yellow

5.4
blue

0.1% water

Methyl red

4.4
red

6.2
yellow/orange

0.1% ethanol

Chlorophenol red

4.8
yellow

6.4
purple

0.1g in 24 mL of 0.01 M NaOH, dilute to 250 mL

Litmus

5.0
red

8.0
blue

0.5% water

Bromocresol purple

5.2
yellow

6.8
purple

0.05% water

Bromothymol blue

6.0
yellow

7.6
blue

0.05% water

Phenol red

6.4
yellow

8.2
red/violet

0.05% water

Neutral red

6.8
red

8.0
orange

0.01% in 50% v/v ethanol

Creosol red

7.0
orange

8.8
purple

0.1% water

Thymol blue

8.0
yellow

9.6
blue

0.05% water

Phenolphthalein

8.2
colourless

9.8
red/violet

0.5% ethanol

Thymolphthalein

9.3
colourless

10.5
blue

0.2% ethanol

Alizarin yellow GG

10.0
bright yellow

12.1
brown/yellow

0.1% ethanol