شناساگرهای اسید و باز

Indicator

pH Range

Quantity per 10 ml

Acid

Base

Thymol Blue

1.2-2.8

1-2 drops 0.1% soln. in aq.

red

yellow

Pentamethoxy red

1.2-2.3

1 drop 0.1% soln. in 70% alc.

red-violet

colorless

Tropeolin OO

1.3-3.2

1 drop 1% aq. soln.

red

yellow

2,4-Dinitrophenol

2.4-4.0

1-2 drops 0.1% soln. in 50% alc.

colorless

yellow

Methyl yellow

2.9-4.0

1 drop 0.1% soln. in 90% alc.

red

yellow

Methyl orange

3.1-4.4

1 drop 0.1% aq. soln.

red

orange

Bromphenol blue

3.0-4.6

1 drop 0.1% aq. soln.

yellow

blue-violet

Tetrabromphenol blue

3.0-4.6

1 drop 0.1% aq. soln.

yellow

blue

Alizarin sodium sulfonate

3.7-5.2

1 drop 0.1% aq. soln.

yellow

violet

α-Naphthyl red

3.7-5.0

1 drop 0.1% soln. in 70% alc.

red

yellow

p-Ethoxychrysoidine

3.5-5.5

1 drop 0.1% aq. soln.

red

yellow

Bromcresol green

4.0-5.6

1 drop 0.1% aq. soln.

yellow

blue

Methyl red

4.4-6.2

1 drop 0.1% aq. soln.

red

yellow

Bromcresol purple

5.2-6.8

1 drop 0.1% aq. soln.

yellow

purple

Chlorphenol red

5.4-6.8

1 drop 0.1% aq. soln.

yellow

red

Bromphenol blue

6.2-7.6

1 drop 0.1% aq. soln.

yellow

blue

p-Nitrophenol

5.0-7.0

1-5 drops 0.1% aq. soln.

colorless

yellow

Azolitmin

5.0-8.0

5 drops 0.5% aq. soln.

red

blue

Phenol red

6.4-8.0

1 drop 0.1% aq. soln.

yellow

red

Neutral red

6.8-8.0

1 drop 0.1% soln. in 70% alc.

red

yellow

Rosolic acid

6.8-8.0

1 drop 0.1% soln. in 90% alc.

yellow

red

Cresol red

7.2-8.8

1 drop 0.1% aq. soln.

yellow

red

α-Naphtholphthalein

7.3-8.7

1-5 drops 0.1% soln. in 70% alc.

rose

green

Tropeolin OOO

7.6-8.9

1 drop 0.1% aq. soln.

yellow

rose-red

Thymol blue

8.0-9.6

1-5 drops 0.1% aq. soln.

yellow

blue

Phenolphthalein

8.0-10.0

1-5 drops 0.1% soln. in 70% alc.

colorless

red

α-Naphtholbenzein

9.0-11.0

1-5 drops 0.1% soln. in 90% alc.

yellow

blue

Thymolphthalein

9.4-10.6

1 drop 0.1% soln. in 90% alc.

colorless

blue

Nile blue

10.1-11.1

1 drop 0.1% aq. soln.

blue

red

Alizarin yellow

10.0-12.0

1 drop 0.1% aq. soln.

yellow

lilac

Salicyl yellow

10.0-12.0

1-5 drops 0.1% soln. in 90% alc.

yellow

orange-brown

Diazo violet

10.1-12.0

1 drop 0.1% aq. soln.

yellow

violet

Tropeolin O

11.0-13.0

1 drop 0.1% aq. soln.

yellow

orange-brown

Nitramine

11.0-13.0

1-2 drops 0.1% soln in 70% alc.

colorless

orange-brown

Poirrier’s blue

11.0-13.0

1 drop 0.1% aq. soln.

blue

violet-pink

Trinitrobenzoic acid

12.0-13.4

1 drop 0.1% aq. soln.

colorless

orange-red