English name：Potassium hydrogen phthalate；Potassium acid phthalate；Phthalic acid potassium acid salt；Phthalic acid monopotassium salt

Other names: potassium hydrogen benzoate; Potassium hydrogen phthalate; Potassium hydrogen 1,2-benzoate; 1,2-benzoic acid monopotassium salt

CAS No.: 877-24-7

C8H5KO4=204.22

grade: gr

Content: ≥ 99.8%

pH(50g/L，25℃)：3.8～4.2

Heavy metals: ≤ 0.0005%

Chloride: ≤ 0.002%

Clarity test: acceptable

Drying loss: ≤ 0.03%

Total sulfur compounds: ≤ 0.006%

Water insoluble matter: ≤ 0.03%

Sodium: ≤ 0.01%

Ammonium: ≤ 0.003%

Iron: ≤ 0.0003%

Physicochemical Properties: colorless monoclinic crystal or white crystalline powder. Stable in air. Soluble in about 12 parts of cold water and 3 parts of boiling water, slightly soluble in ethanol. The solution is acidic. The pH of 0.05mol/l aqueous solution at 25 ℃ is 4.005. The relative density (d254) is 1.636. Melting point 295 ~ 300 ℃ (decomposition).

Purpose: biochemical research. Analytical reagent. Benchmark for calibrating alkali. Prepare buffer solution

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