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Due to a color change from blue to red at pH 3.0–5.2, Congo red can be used as a pH indicator.Since this color change is an approximate inverse of that of litmus, it can be used with litmus paper in a simple parlor trick: add a drop or two of Congo red to both an acid solution and a base solution.
Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pK a of 5.1. [2]
The red bend represents the blood of martyrs, and the gold frame represents the riches of the land. [1] 1964–1966 Democratic Republic of the Congo: 1966–1971 The red and gold bend sinister was changed to a reduced bend sinister: 1971–1997 Republic of Zaire: Light green emblazoned with a yellow circle containing an arm holding a red torch
Calconcarboxylic acid (IUPAC name 3-hydroxy-4-[(2-hydroxy-4-sulfonaphthalen-1-yl)diazenyl]naphthalene-2-carboxylic acid; commonly called Patton and Reeder's Indicator) is an azo dye that is used as an indicator for complexometric titrations of calcium with ethylenediaminetetraacetic acid (EDTA) in the presence of magnesium. [2]
Cresol red (full name: o-cresolsulfonephthalein) [1] is a triarylmethane dye frequently used for monitoring the pH in aquaria. Cresol red ( pH indicator ) below pH 7.2
Para red (paranitraniline red, Pigment Red 1, C.I. 12070) is a dye. Chemically, it is similar to Sudan I. It was discovered in 1880 by von Gallois and Ullrich. It dyes cellulose fabrics a brilliant red color, but is not very fast. The dye can be washed away easily from cellulose fabrics if not dyed correctly. Acidic and basic stages both occur ...
Reports indicate that 70 Christians were beheaded by Islamic militants in the Democratic Republic of the Congo. The group that killed the faithful is an affiliate of the Islamic state.
Economic indicators for 1990 were even more dismal. IMF credit had expired, and large public-expenditure deficits were expected from to pay increases for government workers. The final figures for 1990 showed a decline in the GDP of 2.6 percent, 90 percent inflation in consumer prices, and further devaluation of the zaire against Western currencies.