Thymolphthalein, Indicator ACS,Reag. Ph Eur, Merck KGaA (CAT#: STEM-L-1274-LKN)

Thymolphthalein, model 1.08175 from Merck KGaA is indicator solution.

Grade: ACS reagent, Reag. Ph. Eur.
MP: 254 °C.
Bulk density: 400 kg/m3.
Storage conditions: no restrictions.
InChI key: LDKDGDIWEUUXSH-UHFFFAOYSA-N.

Identity (UV/VIS-Spectrum): passes test.
Appearance: White to almost white powder, eventually slightly yellowish.
Clarity of solution (1 g/l; ethanol): passes test.
Absorption maximum λmax. (buffer pH 10.5): 592 - 596 nm.
Spec. Absorptivity A 1%/1cm (λmax; 0.01 g/l; buffer pH 10.5; calculated on anhydrous substance): 800 - 900.
Transition range: pH 9.0 - pH 10.5 colourless - blue.
Transition range (according to ACS): passes test.
Transition interval (according Reag. Ph. Eur.): passes test.
Loss on drying (110 °C): ≤ 1 %.