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Items
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Standard
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Results
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IDENTIFICATION
ASSAY
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A: Infrared absorption
B: Chromatographic identity
(
C
8
H
8
O
3
)
98.0 ~ 100.5 per cent
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Conforming to Standard.
Conforming to Standard.
99.5%
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Limit of salicylic
acid and
dimethyl 4-hydroxyisophthalate
SPECIFIC TESTS
Solubility in 70% alcohol
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Salicylic acid: NMT 0.1%
Dimethyl 4- hydroxyisophthalate: NMT 0.5%
Dissolves in 70% alcohol, the solution shows NMT a slight cloudiness
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0.01%
0.02%
Conforming to Standard.
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Relative density
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Between 1.180 and 1.185
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1.183
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Optical Rotation
Specific gravity
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The angular rotation not exceeding
-1.5
°
in a 100-mm tube.
1.180-1.185
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-0.01
°
1.183
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