Xanthydrol R.

C₁₃H₁₀O₂ (SRIP, 1963, p. 210).

Xanthydrol TS.

Procedure. Dissolve 20 mg of xanthydrol R in 1 mL of hydrochloric acid (~420 g/l) TS and 99 mL of acetic acid (~300 g/l) TS.

m-Xylene

1,3-Dimethylbenzene, C₈H₁₀.

Description. Clear, colourless, flammable liquid, practically insoluble in water, miscible with ethanol (96 per cent).

Relative density = 0.884.

Refractive index = 1.497.

Boiling point. About 139 °C.

Melting point. About – 47 °C.

Xylene R.

C₈H₁₀ (SRIP, 1963, p. 215).

o-Xylene R

1,2-Dimethylbenzene; C₈H₁₀.

Description. Clear, colourless, flammable liquid, practically insoluble in water, miscible with ethanol (~750 g/L) TS

Relative density = 0.881.

Refractive index = 1.505.

Boiling point. About 144°C.

Xylenol orange indicator mixture R.

Procedure. Mix 0.1 g of xylenol orange R with 10 g of potassium nitrate R.

Xylenol orange R

[3H-2,1-Benzoxathiol-3-ylidene bis[(6-hydroxy-5-methyl-m-phenylene) methylenenitrilo]] tetraacetic acid, S, S-dioxide, C₃₁H₃₂N₂O₁₃S.

Description. An orange powder.

Solubility. Soluble in water and ethanol (~750 g/l) TS.