Potassium hydrogen phthalate
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Potassium hydrogen phthalate
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CAS No:
877-24-7
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Formula:
C8H6O4.K
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Chemical Name:
Potassium hydrogen phthalate
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Synonyms:
1,2-Benzenedicarboxylic acid,potassium salt (1:1);Phthalic acid,monopotassium salt;1,2-Benzenedicarboxylic acid,monopotassium salt;Potassium acid phthalate;Potassium biphthalate;Potassium hydrogen phthalate;Monopotassium phthalate;Hydrogen potassium phthalate;Monopotassium 1,2-benzenedicarboxylate;KAP
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CAS No:
Characteristics
77.4
-0.25170
White Solid
1.006 g/mL at 20 °C
220 °C @ Solvent: Water
98.5-99.5;°C/740;mmHg(lit.)
196.7ºC
H2O: 80 G/L (20 ºC)
Store at RT.
LD50 orally in Rabbit: > 3200 mg/kg
Safety Information
UN17898/PG3
1
36/38-36/37/38-34-61-60
26-36-24/25-22-45-36/37/39-53
CZ4326000
Xi,C,T
Stable. Incompatible with strong oxidizing agents.
P201, P202, P261, P264, P271, P280, P281, P302+P352, P304+P340, P305+P351+P338, P308+P313, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
H315
Potassium hydrogen phthalate Use and Manufacturing
Take 660g caustic potash (85%) and dissolve it in 1L of water. Heat, add 1480g of phthalic anhydride in portions with stirring, heat to react for 0.5h, and filter. The filtrate was concentrated to saturation, allowed to cool to room temperature, the crystals were filtered off with suction, and dried to obtain the finished product.
As primary standard for preparing volumetric alkali solutions, also as a buffer in pH determinations.
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