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Specifications

Catalog #	P4900
Purity	99.9%
Appearance	White crystalline powder
Solubility	Clear, colorless and complete
Insoluble Matter	0.005%
pH (0.05M)	4.00 ± 0.1
Chlorine	0.004%
Sulfur	0.004%
Iron	0.0005%
Sodium	0.005%
Heavy Metals (Pb)	0.0005%
CAS Number	877-24-7
Molecular Formula	C8H5O4K
Molecular Weight	204.2
Important Note	This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.
Alternate names	Potassium acid phthalate; Potassium biphthalate; Phthalic acid monopotassium salt