Draw the structures of fluorescein and napthol yellow, state their applications.
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Naphthol yellow S. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Naphthol yellow S is an organic compound that is a dye. ... At one time it was a popular food colorant but it was delisted in 1959 in the U.S.
Chemical formula: C10H4N2Na2O8S
CAS Number: 846-70-
Fluorescein sodium, the sodium salt of fluorescein, is used extensively as a diagnostic tool in the field of ophthalmology and optometry, where topical fluorescein is used in the diagnosis of corneal abrasions, corneal ulcers and herpetic corneal infections.
Solubility in water: Slightly
Chemical formula: C20H12O5
Melting point: 314 to 316 °C (597 to 601 °F; 587 to 589 K)
Density: 1.602 g/mL
Chemical formula: C10H4N2Na2O8S
CAS Number: 846-70-
Fluorescein sodium, the sodium salt of fluorescein, is used extensively as a diagnostic tool in the field of ophthalmology and optometry, where topical fluorescein is used in the diagnosis of corneal abrasions, corneal ulcers and herpetic corneal infections.
Solubility in water: Slightly
Chemical formula: C20H12O5
Melting point: 314 to 316 °C (597 to 601 °F; 587 to 589 K)
Density: 1.602 g/mL
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