Home /
Determination of the acidity constant of bromothymol blue

Determination of the acidity constant of bromothymol blue

VC4.2.2.1

Spectra of bromthymol blue solutions at different pH values

This product is classified as a dangerous good and is not available for online purchase.

For ordering the dangerous good or other information please contact our customer service center.
This experiment/set up contains dangerous goods.
These are not available for online purchase.
You may order the experiment/set up without the dangerous goods.

For ordering the dangerous good or other information please contact our customer service center.
Email: webshopuk@ld-didactic.de
Telephone:+49 (0) 22 33 / 604 – 319
Go to contact form

Request an offer

Name *

Email *

Thank you for your inquiry. We will get back to you as soon as possible.

Description

In experiment C4.2.2.1, the pH-dependent colour of the indicator bromothymol blue is used to determine the pKa value of the dye. The colouration enables the simultaneous determination of the concentration of the protonated (yellow) and non-protonated (blue) form of the indicator, with which, in turn, the Henderson-Hasselbalch equation

can be used to compute the pKa value.

Components of equipment sets

1	467252	Compact spectrometer, complete
2	664470	Rectangular cuvette cell, glass, 10 x 10 mm
1	664474 4	Rectangular cuvette cell, polystyrene, 10 x 10 mm
1	665996 4	Graduated pipette, 5 ml
1	666003 4	Pipetting ball (Peleus ball)
5	602345 4	Laboratory bottle, 100 ml, GL 45 thread
2	665754 4	Measuring cylinder 100 ml, with plastic base
2	602782 4	Glass rod, 200 mm, diam. 5 mm
1	ADAHCB602H	Precision Balance, 600 g /0,01g, with USB interface
1	6674781 8	Digital pH-Meter 201
1	6744600 4	Buffer solution set, 250 ml EUH208 EUH210
1	6710800 4	Bromothymol blue solution, 0.1 %, 50 ml
1	6746950 4	Hydrochloric acid, 0.1 mol/l, 500 ml Warning H290
1	6738410 4	Sodium hydroxide solution, 0.1 mol/l, 500ml Warning H290
1	6736710 4	Disodium hydrogen phosphate, 250 g
1	6736010 4	Sodium dihydrogenphosphate, 250 g
1	664137 8	Beaker, Boro3.3, 100 ml, tall
1	661243 4	Wash bottle PE 500 ml
1	6753400 4	Water, pure, 1 l
1		additionally required: PC with Windows XP/Vista/7/8/10 (x86 or x64)

Experiment Instructions

PDF (Experiment description)

C4.2.2.1 Determination of the acidity constant of bromothymol blue

Print page

Technical Service & Support:

Online Service Portal
Do you have any questions or suggestions regarding our devices, products, experiments, equipment sets or about our software? You need spare parts? FORM

Repair Service
You would like to register a repair? FORM

Europe

For European distributors, please visit: European distributors

Worldwide requests

Determination of the acidity constant of bromothymol blue

Description

Components of equipment sets

Experiment Instructions

Contact Us