Methyl orange (geliantin, sodium 4- (4-dimetilaminofenilazo) benzenesulfonate) - known acid-base indicator, synthetic organic krasiteliz group of azo dyes, is a sodium salt.
Appearance at normal conditions: orange-yellow leaves or powder, flakes.
Is used as an acid-base indicator in determining the titrant strong oxidants, spectrophotometric determination of oxidants (chromium, bromine).
0.1% aqueous solution is used in analytical chemistry kakindikator.
Changes color from red in acid medium (pH 3,1 to 4,4) to orange in the yellow and neutral alkaline.