Merck 103026 0025 Bromothymol Blue indicator Acs 25 GR.

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Description
Catalogue Number	103026
Synonyms	3',3''-Dibromothymolsulfonphthalein, BTB

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Product Information
CAS number	76-59-5
EC number	200-971-2
Grade	ACS,Reag. Ph Eur
Hill Formula	C₂₇H₂₈Br₂O₅S
Molar Mass	624.40 g/mol
HS Code	2934 99 90
Structure formula Image
Quality Level	MQ200

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Physicochemical Information
Melting Point	201 °C
Bulk density	450 kg/m3

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Safety Information according to GHS
Storage class	10 - 13 Other liquids and solids
WGK	WGK 3 highly hazardous to water
Disposal	3\nRelatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.

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Storage and Shipping Information
Storage	Store at +2°C to +30°C.

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Specifications
Identity (UV/VIS-Spectrum)	passes test
Clarity of solution (1 g/l; ethanol)	passes test
Transition range	pH 5.8 - pH 7.6 yellow - blue
Absorption maximum λ 1 max. (buffer pH 5.8)	430 - 435 nm
Absorption maximum λ 2 max. (buffer pH 7.6)	615 - 618 nm
Spec. Absorptivity A 1%/1cm (λ 1 max.; 0.005 g/l; buffer pH 5.8; calc. on dried substances)	260 - 305
Spec. Absorptivity A 1%/1cm (λ 2 max.; 0.005 g/l; buffer pH 7.6; calc. on dried substances)	455 - 530
Loss on drying (110 °C)	≤ 3 %
Transition range (according to ACS)	passes test
Sensitivity test	passes test