Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Often used in titrations, it turns colorless in acidic solutions and pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. In strongly basic solutions, phenolphthalein's pink color undergoes a rather slow fading reaction and becomes colorless again.
Items |
Standards |
Results |
Characteristics |
A white or almost white powder ,practically insoluble in water ,soluble in alcohol |
Conform |
Melting temperature |
≥260℃ |
260.5℃~262.6℃ |
Identification |
A Positive B Positive |
A Positive B Positive |
Appearance of solution |
The solution is clear and not more intensely coloured than reference solution Y7 |
Complies |
Related substances |
Less than 0.5% |
< 0.5% |
Heavy metals |
≤10ppm |
<10ppm |
Arsenic |
≤8ppm |
<8ppm |
Acidity or Alkalinity |
Complies |
Complies |
Chlorides |
≤100ppm |
<100ppm |
Sulphates |
≤200ppm |
<200ppm |
Organic volatile impurities |
pass |
pass |
Chromatographic impurities |
≤1.0% |
<1.0% |
Fluoran |
To pass test |
Complies |
Loss on drying |
≤0.50% |
0.10% |
Sulphated ash (Residue on ignition) |
≤0.10% |
0.02% |
Assay |
98.0%~101.0% (C20H14O4) |
99.8% |
Remark |
Storage condition: Well closed container, store protected from light |
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