Bromothymol blue Image File history File links Size of this preview: 637 × 600 pixelsFull resolution (1100 × 1036 pixel, file size: 46 KB, MIME type: image/png) File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Size of this preview: 596 × 600 pixelsFull resolution (1093 × 1100 pixel, file size: 276 KB, MIME type: image/png) File historyClick on a date/time to view the file as it appeared at that time. ...
Systematic (IUPAC) name
4,4'-(3H-2,1 Benzoxathiol-3-ylidene) bis [2 bromo-3-methyl-6-(1-methylethyl)phenol] S,S-dioxide
Abbreviations
BTB
Identifiers
CAS number	76-59-5
PubChem	6450
Chemical data
Formula	C27H28Br2O5S
Molar mass	624.39
pKa	7.10
SMILES	CC(C)c1cc(c(C)c(Br)c1O)C3(O[S+] (=O)(O)c2ccccc23)c4cc(C(C)C)c(O)c(Br)c4C
Physical data
Density	1.25 g/cm³
Melt. point	202 °C (396 °F)
Complete data

Bromothymol Yellow (also known as dibromothymolsulfonephthalein, Bromthymol Blue, and BTB) is a chemical indicator for weak acids and bases. The chemical is also used for observing photosynthetic activities or respiratory indicators (turns yellow as CO₂ is added). IUPAC nomenclature is a systematic way of naming organic chemical compounds. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences and alloys. ... PubChem is a database of chemical molecules. ... A chemical formula is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... For other uses, see Carbon (disambiguation). ... This article is about the chemistry of hydrogen. ... Bromo redirects here. ... General Name, symbol, number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, period, block 16, 2, p Appearance colorless (gas) pale blue (liquid) Standard atomic weight 15. ... This article is about the chemical element. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... The acid dissociation constant (Ka), also known as the acidity constant or the acid-ionization constant, is a specific equilibrium constant for the reaction of an acid with its conjugate base in aqueous solution [1]. // When an acid dissolves in water, it partly dissociates forming hydronium ions and its conjugate... The simplified molecular input line entry specification or SMILES is a specification for unambiguously describing the structure of chemical molecules using short ASCII strings. ... For other uses, see Density (disambiguation). ... The melting point of a crystalline solid is the temperature range at which it changes state from solid to liquid. ... Acids and bases: Acid-base extraction Acid-base reaction Acid dissociation constant Acidity function Buffer solutions pH Proton affinity Self-ionization of water Acids: Lewis acids Mineral acids Organic acids Strong acids Superacids Weak acids Bases: Lewis bases Organic bases Strong bases Superbases Non-nucleophilic bases Weak bases edit A... For other uses, see Acid (disambiguation). ... Acids and bases: Acid-base extraction Acid-base reaction Acid dissociation constant Acidity function Buffer solutions pH Proton affinity Self-ionization of water Acids: Lewis acids Mineral acids Organic acids Strong acids Superacids Weak acids Bases: Lewis bases Organic bases Strong bases Superbases Non-nucleophilic bases Weak bases edit In... The leaf is the primary site of photosynthesis in plants. ...

Bromothymol Blue acts as a weak acid in solution and therefore can be in acid or base forms which appear yellow and blue respectively. It is green in neutral solution. It is typically sold in solid form as the sodium salt of the acid indicator. It also finds occasional use in the laboratory as a biological slide stain. At this point it is already blue, and a drop or two is used on a water slide. The cover slip is placed on top of the water droplet and the specimen in it, with the blue coloring mixed in. It is sometimes used to define cell walls or nuclei under the microscope. For sodium in the diet, see Edible salt. ... ... Wikibooks Transwiki has more about this subject: Microscope slide Microscope slides and cover slips. ...

Bromothymol Blue is mostly used in measuring substances that would have relatively low acidic or basic levels (near a neutral pH). It is often used in pools, fish tanks, or measuring the presence of carbonic acid in a liquid. Addition: Bromthymol is used in Obstetrics for detection of presumed premature rupture of membranes: Carbonic acid (ancient name acid of air or aerial acid) has the formula H2CO3. ...

C₂₇H₂₈Br₂O₅S ⇌ H⁺ + C₂₇H₂₇Br₂O₅S⁻

The pKa for bromothymol blue is 7.10. In chemistry and biochemistry, acid dissociation constant, the acidity constant, or the acid-ionization constant () is a specific type of equilibrium constant that indicates the extent of dissociation of hydrogen ions from an acid. ...

A common demonstration of BTB's pH indicator properties involves exhaling through a tube into a neutral solution of BTB. As carbon dioxide is absorbed from the breath into the solution, forming carbonic acid, the solution changes color from green to yellow. Carbon dioxide is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. ... Carbonic acid (ancient name acid of air or aerial acid) has the formula H2CO3. ...

Indicator colors

BTB indicator in pH acidic, neutral, and alkaline solutions (left to right).

Image File history File linksMetadata Size of this preview: 706 × 599 pixels Full resolution (2032 × 1725 pixel, file size: 2. ... Image File history File linksMetadata Size of this preview: 706 × 599 pixels Full resolution (2032 × 1725 pixel, file size: 2. ... Acids and bases: Acid-base extraction Acid-base reaction Acid dissociation constant Acidity function Buffer solutions pH Proton affinity Self-ionization of water Acids: Lewis acids Mineral acids Organic acids Strong acids Superacids Weak acids Bases: Lewis bases Organic bases Strong bases Superbases Non-nucleophilic bases Weak bases edit A...

See also

• Phenolphthalein

Phenolphthalein is a sensitive chemical with the formula C20H14O4 (often written as HIn in shorthand notation). ...

External links

• J.T.Baker MSDS
• Bromothymol Blue (Sodium Salt) -Sigma Aldrich