Xylenol orange

Chembox new
Name = Xylenol orange
ImageFile = Xylenolorange.svg
ImageSize = 250px
ImageName =
IUPACName = 3,3′-Bis [N,N-bis(carboxymethyl)aminomethyl] -o-
cresolsulfonephthalein tetrasodium salt
Section1 = Chembox Identifiers
CASNo = 3618-43-7
Section2 = Chembox Properties
Formula = C₃₁H₂₈N₂O₁₃SNa₄
MolarMass = 760.59 g mol⁻¹
Solubility = Fully miscible
MeltingPt = 195°C (368 K)
Section7 = Chembox Hazards
FlashPt = Greater than 93.3°C (200°F)
RPhrases = R10, R20, R21, R22, R36, R38
SPhrases = S1/2, S26, S27, S28, S62, S63
NFPA-H = 2
NFPA-R = 2
NFPA-F = 1

Xylenol orange is an organic reagent, most commonly used as a tetrasodium salt as an indicator for metal titrations. Historically, commercial preparations of it have been notoriously impure, sometimes consisting of as little as 20% xylenol orange, and containing large amounts of semi-xylenol orange and iminodiacetic acid. Purities as high as 90% are now available.