Sigma-Aldrich Methylthymol Blue Sodium S

Quality Level

200

Form

solid

Loss

≤7% loss on drying, 50°C/ <1 hPa; 3h

pH

6.2 (20 °C, 10 g/L in H₂O)

Solubility

460 g/L

Bulk Density

570 kg/M³

Amax

430-450 nm (buffer pH 7.0)
602-606 nm (buffer pH 7.0)

Storage Temp.

2-30°C

Inchi

1S/C37H44N2O13S.4Na/c1-19(2)23-11-28(21(5)25(35(23)48)13-38(15-31(40)41)16-32(42)43)37(27-9-7-8-10-30(27)53(50,51)52-37)29-12-24(20(3)4)36(49)26(22(29)6)14-39(17-33(44)45)18-34(46)47;;;;/h7-12,19-20,48-49H,13-18H2,1-6H3,(H,40,41)(H,42,43)(H,44,45)(H,46,47);;;;/q;4*+1/p-4

Inchi Key

DIZZDZCUMBBRSG-UHFFFAOYSA-J

Related Categories

Indicators

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λ 1 (buffer pH 7.0): 602 - 606 nm
Absorption maximum λ 2 (buffer pH 7.0): 430 - 450 nm
Spec. Absorptivity A 1%/1cm (λ1_max; 0.04 g/L; buffer pH 7.0; calc. on dried substance): ≥ 60
Spec. Absorptivity A 1%/1cm (λ2_max; 0.04 g/L; buffer pH 7.0; calc. on dried substance): ≥ 85
Loss on drying (50 °C/ <1 hPa; 3h): ≤ 7%
Suitability as indicator (for metal titration): passes test

Storage Class

11 - Combustible Solids

Wgk_Germany

WGK 3

Flash_Point_F

Not applicable

Flash_Point_C

Not applicable