Metacresol purple

Metacresol purple, m-cresol-sulfonphthalein (indicator) dissolveO.l g in 13.6 mL 0.02A NaOH and dilute with water to 250 mL acid pH range red 0.5-2.5 yellow, alkaline pH range yellow 7.4-9.0 purple. 

Metacresol purple is an indicator that changes from yellow to purple at pH 8.2. 

Sulphonphthaleins. These indicators are usually supplied in the acid form. They are rendered water-soluble by adding sufficient sodium hydroxide to neutralise the sulphonic acid group. One gram of the indicator is triturated in a clean glass mortar with the appropriate quantity of 0.1 M sodium hydroxide solution, and then diluted with water to 1 L. The following volumes of 0.1 M sodium hydroxide are required for 1 g of the indicators bromophenol blue, 15.0 mL bromocresol green, 14.4 mL bromocresol purple, 18.6 mL chlorophenol red, 23.6 mL bromothymol blue, 16.0 mL phenol red, 28.4 mL thymol blue, 21.5 mL cresol red, 26.2 mL metacresol purple, 26.2 mL. 

Balanced equation HIn + H20 H30+ + In-, where metacresol purple is represented by HIn... 

Cresol red Crystal Violet Malachite Green Methanil Yellow Thymol Blue Orange IV -2,4-Dinitrophenol -Erythrosin, Na2 salt -Dimethyl Yellow Cl 11020 Bromophenol Blue Congo Red Cl 22120 Methyl Orange Bromocresol Green Alizarin Red S Cl 42750 Methyl Red Cl 13020 -Bromocresol Purple Chlorophenol Red p-Nitrophenol Alizarin Bromothymol Blue Brillant Yellow Phenol Red Neutral Red Cl 50040 -m-NItrophenol -Cresol Red Metacresol Purple Phenolphthalein -Thymolphthalein -P-Naphthyl Violet Alizarin Yellow R 2,4,6-T rinitrotoluene... 

Metacresol Purple R 9cl Orange i j Yellpw j i Grey Violet ... 

The indicator metacresol purple changes from yellow to purple at pH 8.2. At this point it exists in equal concentrations as the conjugate acid and the conjugate base. What are and p for metacresol purple, a weak acid represented as HIn ... 

Metacresol purple. See m-Cresol purple Metacure T-1. See Dibutyltin diacetate Metacur T-9. See Stannous octoate Metacurd T-12. See Dibutyltin dilaurate Metadelphene. See Diethyl toluamide Metaformaldehyde. SeeTrioxane Metahomomenthyl salicylate. See Homosalate Metalaxil. SeeMetalaxyl Metalaxyl... 

The group of necrosis-inducing CWA also includes primary, secondary, and tertiary arsines. These chemical compounds were also analyzed using TLC. Separation of mixtures of these arsines is not difficult, and they can be visualized using Michler s thioketone, iodine, dithizone, and a metacresol purple dye. Using the last reagent it is possible to detect lewisite at the level of 0.05 p,g per spot. ... 

Other Names Phenol, 4,4 -(3H-2,l-benzoxathiol-3-ylidene) i5 [3-methyl-, 5,5-dioxide m-Cresol purple m-Cresol, 4,4 -(3H-2,l-benzoxathiol-3-ylidene)di-, 5,5-dioxide o-Toluenesulfonic acid, a-hydroxy-a,a-fcii(4-hydroxy-(9-tolyl)-, y-sultone 3H-2,l-Benzoxathiole, phenol derivative Cre-sol purple Metacresol Purple NSC 9607 m-Cresolsulfonephthalein CA Index Name Phenol, 4,4 -(l,l-dioxido-3H-2,l-benzoxathiol-3-ylidene) [3-methyl-CAS Registry Number 2303-01-7 Merck Index Number 2577 Chemical Structure... 

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