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BROMOCRESOL GREEN
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PRODUCT IDENTIFICATION |
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3.8 - 5.4 |
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CAS NO. | 76-60-8; 641-19-0 |
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EINECS NO. |
200-972-8 | |||
FORMULA | C21H14Br4O5S | |||
MOL WT. | 698.01 | |||
H.S. CODE | 2934.99.4400 | |||
TOXICITY | ||||
SYNONYMS | Bromocresol green; Bromcresol green; | |||
4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2,6-dibromo-3-methyl)phenol S,S-dioxide; 3',3'',5',5''-Tetrabromo-m-cresolsulfonephthalein; Tetrabromo-m-cresolphthalein sulfone; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2,6-dibromo-m-cresol) S,S-dioxide; alpha-Hydroxy-o-toluenesulfonic acid gamma-sultone; | ||||
SMILES |
C1(c2c(cccc2)S(O1)(=O)=O)(c1c(c(c(O)c(c1)Br)Br)C)c1c(c(c(O)c (c1)Br)Br)C | |||
CLASSIFICATION |
Indicator | |||
EXTRA NOTES |
An indicator and reagent. It has been used in serum albumin determinations and as a pH indicator. | |||
PHYSICAL AND CHEMICAL PROPERTIES | ||||
PHYSICAL STATE | brown crystalline powder | |||
MELTING POINT | 225 C | |||
BOILING POINT | ||||
SPECIFIC GRAVITY | ||||
SOLUBILITY IN WATER |
sparingly soluble in water (soluble in benzene, and very soluble in ethanol and diethyl ether) |
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AUTOIGNITION | ||||
pH | ||||
VAPOR DENSITY | ||||
AUTOIGNITION |
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NFPA RATINGS | ||||
REFRACTIVE INDEX |
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FLASH POINT |
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STABILITY | Stable under ordinary conditions | |||
APPLICATIONS |
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The relationship between the activity of hydrogen ions [exactly hydronium
ions, H(H2O)n+] and concentration of a solution is fundamentally important
to determine the extent of a chemical reaction, as it affects the equilibria and
kinetics of a wide variety of chemical and biochemical reactions. The
hydrogen-ion activity refers to the effective concentration of unassociated
hydrogen ions, the form that directly affects physicochemical reaction rates and
equilibria. The symbol, pH, numerically relates the hydrogen ions concentration
or activity. The pH is approximately equal to the negative logarithm of H+
concentration expressed in molarity. pH 7 is neutral; above it alkalinity
increases and below it acidity increases. pH indicators are usually weak acidic
or basic organic tautomers which exist in more than one structural form of
which at least one form is characteristically colored in relation to different
electronic configuration of the bound. Indicators should not change color
exactly at one pH value, but within a wide pH range. The transition point of an
indicator is defined as the point at which the acid and alkaline forms of the
indicator exist in equal concentrations. Visual transition intervals
are as below:
Phthalein is the moiety in a dye which shows color changes depend on particular hydrogen ion concentrations. Certain phthaleins (e.g. phenolphthalein) have a cathartic action. Bromocresol Green, 3',3'',5',5''-Tetrabromo-m-cresolsulfonephthalein, is a pH used as an indicator form pH 3.8 (yellow) and 5.4 (blue). It is a brown powder sparingly soluble in water, soluble in benzene, and very soluble in ethanol and diethyl ether. The sodium salt is a dark green powder. Both of free acid and sodium salt are used as pH indicator. It was used in serum albumin determinations. Bromocresol Green is used in oil field industry for alkalinity test of mud filtrate. Bromocresol Purple is 5',5''-Dibromo-o-cresolsulfonephthalein, a yellow powder soluble in water. The pH range is from pH 5.2 (yellow) to pH 6.8 (purple). Bromophenol red (CAS RN: 2800-80-8) is 5',5''-Dibromophenolsulfonphthalein, a brown powder with pH range from 5.2 (orange-yellow) to pH 6.8 (red) |
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SALES SPECIFICATION | ||||
APPEARANCE |
dark brown crystalline powder | |||
DYE CONTENT |
95.0% min |
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LOSS ON DRYING |
5.0% max |
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CLARITY OF SOLUTION |
pass |
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TRANSITION INTERVAL |
pH 3.8 (yellow) and 5.4 (blue) |
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SPECIFIC EXT. E | >600 (617 nm, in buffer) | |||
TRANSPORTATION | ||||
PACKING | ||||
HAZARD CLASS | ||||
UN NO. |
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SAFETY INFORMATION | ||||
HAZARD OVERVIEW |
GHS (Globally Harmonised System) Classification: Not a dangerous substance. Potential Health Effects: Eyes - May cause eye irritation. Skin - May be harmful if absorbed through skin May cause skin irritation. Inhalation - May be harmful if inhaled. May cause respiratory tract irritation. Ingestion - May be harmful if swallowed. | |||
HAZARD CODES |
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RISK PHRASES |
36/37/38 | |||
SAFETY PHRASES |
26-36 | |||
PRICE INFORMATION |