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Phenolphthalein Indicator Solution: the Pharmacopoeia Test Solution (U.S. Dispensatory, 1907)
The pharmacopoeia's phenolphthalein indicator: 1 g of phenolphthalein dissolved in 50 cc of alcohol and made up to 100 cc with water. Three drops in 50 cc of liquid turn red with alkali hydroxides or carbonates and colourless with acids.
It works in hot titrations but is not suitable for ammonia.
Source: The Dispensatory of the United States, 19th ed. (1907), pp. 1714-1715. Picture: the book's text.
Beginner
Unknown
Instructions
1
1
Dissolve and make up
Dissolve and make up
Weigh 1 g of phenolphthalein and dissolve it in 50 cc of alcohol, then dilute to 100 cc with water.
Materials for this step:
Phenolphthalein1 1 g
Ethanol - Lab Grade, 95%1 50 cc
Water1 to 100 ccTools needed:
Precision Digital Scale
Measuring Cylinder
Volumetric Flask2
2
Check it is neutral
Check it is neutral
As soon as it is made, and from time to time after, add a few drops to 25 cc of water: a few drops of hundredth-normal alkali should distinctly turn it red. If not, bring it to that point by cautiously adding very dilute sulphuric acid or very dilute alkali.
Tools needed:
Measuring Cylinder3
3
Store and use
Store and use
Keep it in a dark amber bottle away from light. Use about 3 drops for 50 cc of solution to be titrated.
Tools needed:
Amber Glass BottleMaterials
3- 1 1 gPlaceholder
- 1 50 ccPlaceholder
- 1 to 100 ccPlaceholder
Tools Required
4- Placeholder
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- Placeholder
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