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Microscopy stain, blue in acid and red in alkali, made from coal tar for dialysis diffusion experiments and as a yeast stain.ġ2.0 Cresol red (IV), acid-base indicatorĬresol red, indicator grade (o-cresolsulfonephthalein), C21H18O5S Prepare congo red solution: 01% solution in water.
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See: Test Strips Congo Red, (Commercial).Ĭongo Red 4B, Cosmos Red, Cotton Red B, Cotton Red C, Direct Red 28, Direct Red R It can detect chlorine dioxide in drinking water, green to brown-green or brown powder, crystalline powder, crystals, granules or lumps soluble in ethanol, and has a "pharmacy smell".Ĭlayton yellow, direct yellow 9, titan yellow, thiazol yellow G, mimosa, C28H19N5O6S4Na2 Prepare bromophenol blue solution: 0.1 g in 149 mL 0.01 M NaOH + 235.1 mL of water.īromophenol red, C19H12Br2O5S, 3'3"-Dibromophenolsulphonphthaleinīromothymol blue, bromthymol blue (dibromothymolsulfophthalein), C27H28Br2O5S, weak acid.ĥ.6.3 Prepare bromothymol blue acid-base indicatorĭissolve 0.5 g of bromothymol blue in 500 mL of water.Īdd a drop of ammonia solution to turn the solution deep blue in colour.ĩ.0 Chlorophenol red, acid-base indicatorĬhlorophenol red (dichlorophenolsulfonephthalein), C19H12Cl2O5S See 27.124 Dichromatism, bromophenol blue, resazurin, pumpkin seed oil. Prepare bromocresol purple indicator: 0.1 g bromocresol purple in 18.5 mL 0.01 M NaOH + 231.5 mL of water.ħ.0 Bromophenol blue, acid-base indicatorīromophenol blue, C19H10Br4O5S, (tetrabromophenolsulfonephthalein, 2-bromo-2-methylbutane, t-butyl bromide Prepare bromocresol green solution: 0.1 g in 14.3 mL of M NaOH + 235.7 mL of water.Ħ.0 Bromocresol purple, acid-base indicatorīromocresol purple, acid-base indicator, C21H16Br2O5S, dibromo-0-cresolsulfone phthalein Īnthraquinone, C14H8O2, (9, 10-dioxanthracene)īenzopurpurin 4B, acid-base indicator, 1-naphthalene sulfonic acid, benzopurpurin 4b, C34H26N6O6S2, sodium salt,ĭirect red, cotton red 4b, red acid dye, changes from violet to red in the pH range 1.2-4.0, formerly used as a stain andĪs an indicator, for liquid crystal displays, inks, dyes, micro-organism stains.Ĥ.0 Brilliant yellow, acid-base indicatorīrilliant yellow, direct yellow 4, C26H18N4Na2O8S2ĥ.0 Bromocresol green, acid-base indicatorīromocresol green (3',3',5',5'-tetrabromo-m-cresol-sulfonephthalein), C21H14Br4O5S Īlizarin yellow as sodium salt, C13H8N3NaO5. Repeat the process until the solution has a straw yellow colour.Ģ.0 Alizarin yellow R, acid-base indicatorĪlizarin yellow, mordant orange l (sodium salt), azo dye, rust colour, Harmful if ingested.Īlizarin yellow as acid: C13H9N3O5, O2NC6H4N=NC6H3-2-(OH)CO2H. If the solution is not decolorized enough, add 10 mL of M sodium hydroxide solution. The colour should change from red to brown.
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Mix the solution and leave to stand for one day. School Science Lessonsĥ.6.3 Prepare acid-base plant extract indicatorsĪcid fuchsin, Andrade's acid fuchsin, acid violet 19, fuchsin S, fuchsin acid, rubine S, C20H17N3Na2O9S3Īdd 5 g of acid fuchsin to deionized water.Īdd 150 mL of M sodium hydroxide solution.
#HOW TO PREPARE DILUTE AMMONIA SOLUTION HOW TO#
Learn how to prepare useful acid-base indicators.
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