o-Cresolphthalein
AR, alkali soluble
Reagent
Code: #126556
Alias
o-cresolphthalein; 3,3'-Dimethylphenolphthalein, 3,3-bis(4-hydroxy-3-methylphenyl)-1(3H)-isobenzofuranone
CAS Number
596-27-0
science Other reagents with same CAS 596-27-0
blur_circular Chemical Specifications
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Molecular Information
Weight
346.38 g/mol
Formula
C₂₂H₁₈O₄
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Registry Numbers
EC Number
209-881-8
MDL Number
MFCD00005912
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Physical Properties
Melting Point
223-225 °C
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Storage & Handling
Storage
room temperature
description Product Description
o-Cresolphthalein is primarily used as a pH indicator in various analytical and laboratory applications. It is commonly employed in titrations to determine the endpoint of acid-base reactions, particularly in the pH range of 8.2 to 9.8, where it transitions from colorless to pink. This makes it useful in biochemical and clinical laboratories for measuring the pH of solutions or monitoring reactions. Additionally, it is utilized in the determination of calcium levels in biological samples, such as blood serum, where it forms a colored complex with calcium ions, enabling spectrophotometric analysis. Its stability and distinct color change make it a reliable tool in quantitative chemical analysis.
format_list_bulleted Product Specification
| Test Parameter | Specification |
|---|---|
| Ignition Residue (As Sulfate) | 0-0.1 |
| Appearance | White to Tan Powder |
| Infrared Spectrum | Conforms To Structure |
| Solubility (Dilute NaOH) | Clear |
| Visual Transition Interval | pH 8.2 (Colorless)-pH 9.8 (Red/Purple) |
| λ_max | 563.0-568.0 |
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