α-Naphtholphthalein, pure indicator

Supplier: Thermo Scientific

190120050 190120010 190120250
ACRO190120050EA 281 GBP
ACRO190120050 ACRO190120010 ACRO190120250
α-Naphtholphthalein, pure indicator
α-Naphtholphthalein
Formula: C₂₈H₁₈O₄
Melting Pt: 240…250 °C
Storage Temperature: Ambient
MDL Number: MFCD00036202
CAS Number: 596-01-0
EINECS: 209-875-5

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Specification Test Results

Appearance Beige to pink to brown Powder
Infrared spectrum Conforms
Loss on drying ≤5 % (110°C, 1 h)
UV Lambda max 648 to 654 nm (in 0.1N NaOH)
Specific absorbance A (1%/1cm) ≥550 (at lamda max)
Visual transition interval from pH 7.3 (pink-yellow) to pH 8.7 (green-blue)

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