Acide citrique monohydrate - ACS reagent grade, ≥ 99.0%, powder

General description
Citric acid monohydrate is an organic acid. Its molar enthalpy of solution in water has been reported to be ΔsolHm (298.15K, m = 0.0203molkg-1) = (29061±123)Jmol-1. It can be produced by crystallization from mother liquor of citric acid solution at 20-25°C during citric acid synthesis. An investigation of its crystal growth kinetics indicates that growth is linearly dependent on size.

Citric acid monohydrate is an organic weak acid used as a natural preservative in food and beverage products.

Specs :
Impurities : Substances carbonizable by hot sulfuric acid, passes test, ≤0.005% Insoluble matter
ign. residue : ≤ 0.02%
pH : (1.8 at 50 g/l at 20°C)
pKa : (1) 3.13, (2) 4.76, (3) 6.4

Solubility :
 - H₂O: soluble 54 % (w/w) at 10°C (Citric acid in water),
 - H₂O: 59.2 % (w/w) at 20°C (Citric acid in water),
 - H₂O: 84.0 % (w/w) at 100 °C (Citric acid in water)

Anion traces :
 - chloride (Cl^-): ≤ 0.001%,
 - oxalate (C₂O₄^2-): passes test (limit about 0.05%),
 - phosphate (PO₄^3-): ≤ 0.001%,
 - sulfate (SO₄^2-): ≤ 0.002%

Cation traces :
 - Fe: ≤ 3 ppm,
 - Pb: ≤ 2 ppm