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Copper(II) sulphate pentahydrate, 500 g

≥99,5 %, p.a., ACS, ISO
Examples of effect: Damage metals and burn body tissues; may cause serious eye damage. Safety: Avoid contact; wear safety spectacles and gloves. In the event of contact with eyes and skin, rinse with water.
Examples of effect: Lead to damage to heath, cause irritation to eyes, skin or respiratory organs. Are fatal in larger quantities. Safety: As previously stated, in the event of skin irritation or contact with eyes, rinse with water or a suitable medium.
Examples of effect: Are harmful to aquatic organisms, toxic or highly toxic, acute or with long-term effects. Safety: To be disposed of as hazardous waste only, do not allow into the environment under any circumstances.
Danger
H302-H318-H410
i harmful if swallowed, causes serious eye damage, very toxic to aquatic life with long lasting effects
P273 P280 P301+P312 P305+P351+P338
i avoid release to the environment, wear protective gloves/eye protection, IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell, IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing
Pack Qty.
Pack.
Coppervitriole
Empirical formula CuSO4 · 5 H2O
Molar mass (M) 249,69 g/mol
Density (D) 2,286 g/cm³
Melting point (mp) 110 °C
ADR 9 III
WGK 3
CAS No. [7758-99-8]
EG-Nr. 616-477-9
UN-Nr. 3077

For the determination of reducing sugar (Fehling's solution). Used as spray in TLC.

€31.10/Pack Qty. 

excl. VAT. | 500 g per Pack Qty.

Art. No. P024.1

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Copper(II) sulphate pentahydrate
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P024.2 1 kg plastic €53.25
P024.3 2.5 kg plastic €99.90
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Downloads / MSDS


General information

Determination of Nitrogen according to Kjeldahl

The most common technique for measuring the amount of nitrogen in organic matter is the Kjeldahl method, which is used in a wide range of sectors such as environmental analysis, food analysis, water analysis and agricultural analysis, as well as in the pharmaceutical and chemical industries. In this traditional method, a precisely weighed sample is broken down using concentrated sulphuric acid, a process which digests its organic contents and reacts nitrogen to form ammonium sulphate.(CHNO)(s) → CO2 (g) + SO2 (g) + H2O (g) + NH4SO4 (solv, H2SO4)A catalyst or catalyst mixture consisting of copper, selenium, mercury and/or titanium is added to speed up the reaction. Sodium or potassium sulphate is used to give the sulphuric acid a higher boiling point. If the nitrogen is contained in a nitro, nitroso or azo compound, however, the mixture must be reduced with zinc before digestion takes place.
The nitrogen is now present in the sulphuric acid as ammonium sulphate. Adding a strong base (such as NaOH) neutralises the sulphuric acid and liberates ammonia from the solution.NH4SO4 (solv) + 2 NaOH (aq) → Na2SO4 (aq) + 2 NH3 (g) + 2 H2O (l) The ammonia is led into an acid (such as boric acid) by means of steam distillation.B(OH)3 (aq) + 2 H2O (l) + NH3 (g) → B(OH)4- (aq) + NH4+ (aq) The resulting strong base (borate ion) is back-titrated with a strong acid (hydrochloric acid or sulphuric acid). The excess weak boric acid is not captured in the process. A Tashiro's indicator that changes colour in the acid is used for titration. The amount of acid that has been used up can then be converted into the amount of nitrogen in the sample. NH4+ (aq) + B(OH)4- (aq) + HCl (l) → NH4Cl (aq) + B(OH)3 (aq) + H2O (l)To calculate the protein content of the sample, the varying nitrogen content of the amino acids must be checked and the relevant conversion factors applied. The nitrogen contained in food derives mainly from proteins, but different samples may also contain other sources of nitrogen.


Salts for Analysis

Our salts for analysis are manufactured under strict production guidelines. Analytical purity and best quality reliably characterize each batch. Salts in p.a. quality made by Carl ROTH meet the high requirements for reproducible results. Most of our salts are additionally specified according to international standards like ACS and ISO.

Definition:
p.a.: pro analysi (for analysis)ACS: American Chemical SocietyISO: International Standard Organisation


Certificates of Analysis

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The following analysis certificates have been found:

Guarantee analysis

Assay (iodom.)≥99,5 %
pH value (5 % solution)≥3,8
Insoluble matter≤0,005 %
Total nitrogen (as N)≤0,001 %
Chloride (Cl)≤0,001 %
Arsenic (As)≤0,0001 %
Cadmium (Cd)≤0,003 %
Calcium (Ca)≤0,005 %
Iron (Fe)≤0,003 %
Magnesium (Mg)≤0,005 %
Nickel (Ni)≤0,005 %
Zinc (Zn)≤0,03 %
Cobalt (Co)≤0,001 %
Potassium (K)≤0,001 %
Sodium (Na)≤0,005 %
Lead (Pb)≤0,005 %

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