Timolftaleina

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Timolftaleina
formula di struttura
formula di struttura
Caratteristiche generali
Formula bruta o molecolareC28H30O4
Massa molecolare (u)430,55 g/mol
Aspettosolido bianco
Numero CAS125-20-2
Numero EINECS204-729-7
PubChem31316
SMILES
CC1=CC(=C(C=C1C2(C3=CC=CC=C3C(=O)O2)C4=CC(=C(C=C4C)O)C(C)C)C(C)C)O
Proprietà chimico-fisiche
Solubilità in acqua(20 °C) quasi insolubile
Temperatura di fusione253 °C (526 K)
Indicazioni di sicurezza
Frasi H---
Consigli P--- [1]
Modifica dati su Wikidata · Manuale

La timolftaleina è un indicatore. A temperatura ambiente si presenta come un solido bianco dall'odore tenue.

Viene utilizzata, in soluzione alcolica all'1%, nelle pratiche di laboratorio come indicatore cromatico per le titolazioni acido-base. Il pH di viraggio è compreso tra i valori 9,3-10,5; infatti in una soluzione con un valore di pH che precede il punto di viraggio è incolore mentre, superato il valore del punto di viraggio è blu.

Note

  1. ^ Sigma Aldrich; rev. del 02.02.2011

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