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Xylenol Orange, 10 g




Xylenol orange is an indicator used in complexometric titration. Xylenol orange is a red-brown crystals soluble in water and insoluble in ethanol, diethyl ether and acetone. It is synthesized by aminomethylation of cresol red with formaldehyde and iminodiacetic acid in acetic acid medium. It is mainly used as a metallochromic indicator (color transition from red to yellow) for direct complexometric determination of zinc, calcium, cadmium, copper(II), iron(III), manganese(II)), nickel(II), lead(II), and some rare earth elements ions; for reverse titration – thorium ions, bismuth, thallium, zinc, aluminum; as a reagent for spectrophotometric determination of some metals – niobium, zirconium, gallium; as an acid-base indicator (color change in the pH range of 5.4-7.4 from yellow to red-violet. Titration can be done with trilon B (ethylenediaminetetraacetic acid). Formula: C31H28N2Na4O13S. CAS # 3618-43-7. Qualification: CE. Content of xylenol orange not less than 25%. TU 6-09-1509-78. Synonyms: xylenol orange, o-Cresol sulfophthalein-3,3′-bis(methyliminodiacetic acid) tetrasodium salt; 3,3′-Bis[N,N-di-(carboxymethyl)aminomethyl]-o-cresol sulfophthalein tetrasodium salt.


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