Titration

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Description
Preparing an Analyte Solution
Selecting a Mixing Technique
Using an Indicator during a Titration
Using a Chemical or Physical Property during a Titration
Additional Topics
Which Indicator?
How Much Indicator?
Is This Solution Too Pink?
Why Is My Titration Taking More Than 50 mL?
Should I Do Another Trial?
Related Modules
Buret module
Volumetric Pipet module
Mohr Pipet module
Balance module
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Common Questions about Titrations

 

"Which indicator should I use?

An acid-base indicator should be selected so that the color change occurs in the correct pH range, the color change is sharp, and the color change is visible to the student. A table of possible indicators is listed below.

TABLE 1.
Indicators for use in acid-base titrations

Indicator

Transition range
pH

Color below range

Color above range

Methyl yellow

2.9-4.0

red

yellow

Methyl orange

3.1-4.4

red

orange

Bromocresol green

3.8-5.4

yellow

blue

Methyl red

4.2-6.3

red

yellow

Bromothymol blue

6.2-7.6

yellow

blue

Phenolphthalein

8.3-10.0

colorless

pink

Thymolphthalein

9.3-10.5

colorless

blue