Hydrochloric acid 25%

for analysis EMSURE®

Hydrogen chloride solution, Hydrochloric acid solution
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:

storage conditions

no restrictions.

Quality Level

vapor pressure

12 hPa ( 20 °C)


<1 (20 °C in H2O)

kinematic viscosity

1.73 cSt(20 °C)


107 °C/1013 hPa


-52 °C


1.12 g/cm3 at 20 °C

storage temp.


SMILES string




InChI key


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General description

for analysis EMSURE®

Analysis Note

Assay (alkalimetric)≥ 25.0 %Color≤ 10 HazenBromide (Br)≤ 50 ppmFree chlorine (Cl)≤ 0.5 ppmSulfate (SO₄)≤ 1 ppmSulfite (SO₃)≤ 1 ppmAl (Aluminium)≤ 0.050 ppmAs (Arsenic)≤ 0.01 ppmBa (Barium)≤ 0.020 ppmBe (Beryllium)≤ 0.020 ppmBi (Bismuth)≤ 0.100 ppmCa (Calcium)≤ 0.500 ppmCd (Cadmium)≤ 0.010 ppmCo (Cobalt)≤ 0.010 ppmCr (Chromium)≤ 0.020 ppmCu (Copper)≤ 0.020 ppmFe (Iron)≤ 0.200 ppmGe (Germanium)≤ 0.050 ppmK (Potassium)≤ 0.100 ppmLi (Lithium)≤ 0.010 ppmMg (Magnesium)≤ 0.100 ppmMn (Manganese)≤ 0.010 ppmMo (Molybdenum)≤ 0.020 ppmNH₄ (Ammonium)≤ 1 ppmNa (Sodium)≤ 0.500 ppmNi (Nickel)≤ 0.020 ppmPb (Lead)≤ 0.020 ppmSr (Strontium)≤ 0.010 ppmTi (Titanium)≤ 0.100 ppmTl (Thallium)≤ 0.050 ppmV (Vanadium)≤ 0.010 ppmZn (Zinc)≤ 0.050 ppmZr (Zirconium)≤ 0.100 ppmResidue on ignition (as SO₄)≤ 5 ppmMinimum shelf life: see product label

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Photometric determination with pyridylazoresorcinol (PAR) subsequent to acid extraction
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AQA Standard for free chlorine - Preparation of a standard solution for free chlorine - Preparation of a stock solution of free chlorine: First prepare a 1:10 dilution using a sodium hypochlorite solution containing approximately 6 - 14 % of active chlorine. For this pipette 10 ml of sodium hypochlorite solution into a calibrated or conformity-checked 100-ml volumetric flask and then make up to the mark with water for analysis.
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