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Sodium hydroxide, 25 kg

≥98 %, p.a., ISO, in pellets
Icon_EVE-EUD Please consider that this product might be liable to some legal sanctions as for example to obtain an end user declaration or the prohibition of some applications. For details please do contact your counterpart in our sales department!
Mogelijke gevolgen: vernietigen metalen en zijn bijtend voor lichaamsweefsel; ernstig oogletsel is mogelijk. Veiligheid: contact vermijden; veiligheidsbril en handschoenen dragen. Bij contact ogen en huid met water spoelen.
Danger
H290-H314
i may be corrosive to metals, causes severe skin burns and eye damage
P233 P280 P303+P361+P353 P305+P351+P338 P310
i keep container tightly closed, wear protective gloves/eye protection, IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water [or shower], IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing, immediately call a POISON CENTER/doctor
Verwante producten
VE
Verp.
Empirical formula NaOH
Molar mass (M) 40,0 g/mol
Density (D) 2,13 g/cm³
Boiling point (bp) 1388 °C
Melting point (mp) 323 °C
ADR 8 II
WGK 1
CAS No. 1310-73-2
EG-Nr. 215-185-5
UN-Nr. 1823

Reagent for the preparation of sodium hydroxide solution.

654,70 €/VE 

Excl. btw | 25 kg Per VE

Bestelnr. 6771.5

Op voorraad
Vrij van verzendingskosten vanaf 250 €
Snelle en betrouwbare levering!
Vanaf 6 VE 621,96 €/VE
Vanaf 24 VE 589,23 €/VE

Productdetails



Sodium hydroxide ≥98 %, p.a., ISO, in pellets

Technische informatie
Toepasbaar (als droogmiddel) voor Alkaline fluids (e.g. amines) 
Niet toepasbaar (als droogmiddel) voor Acids, acid derivatives, phenols 
Partikel grootte ~5 mm
Sodium hydroxide
Geselecteerde hoeveelheid:   0
  1. Tussentotaal:  0.00
Bestelnr. VE Verp. Prijs Hoeveelheid
6771.1 1 kg plastic

44,00 €

6771.2 5 kg plastic

163,95 €

6771.3 500 g plastic

26,35 €

6771.4 2,5 kg plastic

88,05 €

6771.5 25 kg plastic

654,70 €

6771.6 10 kg plastic

306,40 €

Op voorraad
Beschikbaar
In bestelling
Niet meer verkrijgbaar
Leveringsdatum onbekend
Geselecteerde hoeveelheid:   0
  1. Tussentotaal:  0.00

Downloads / MSDS


Algemene informatie

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.


Determination of biological oxygen demand (BOD)

BOD (biochemical oxygen demand) is a measure of the amount of oxygen that microorganisms need to break down the organic material in a water sample over a specific period of time. It is important to calculate the oxygen concentration at the start and end of the measuring time, which is usually five days and is expressed as an index (BOD5). Chemical, electrochemical or physical methods are used for this calculation.


Desiccants

Desiccants can absorb water and bind it chemically (reversibly or irreversibly) or physically. The main desiccants can be subdivided into four categories:

  • non-renewable chemical desiccants
  • renewable chemical desiccants
  • silica gels
  • molecular sieves


Drying methods for solvents

Solvent Molecular

sieve
Potassium

carbonate
Calcium

chloride
Phosphous

pentoxide
Acetic acid - - - +
Acetic acid anhydride - - + -
Acetic acid ethyl ester 4 Å + - +
Acetic acid methyl ester 4 Å + - +
Acetone 3 Å + + -
Acetonitrile 3 Å + + +
Benzene 4 Å - + -
1-Butanol - + - -
2-Butanol - + - -
1-Butanone - + + -
Chloroform 4 Å - + +
Cyclohexane 4 Å - - -
Dichloremethane 4 Å - - -
Diethylether 4 Å - + -
Diisopropyl ether 4 Å - + -
Dimethyl formamide 4 Å - - -
Dioxan 4 Å - + -
Ethanol 3 Å - - -
Ethyle formate - - + -
n-Hexane 4 Å - - -
Methanol 3 Å - + -
2-Propanol 3 Å - - -
Pyridine 4 Å - - -
Tetrahydrofurane 4 Å - + -
Toluene 4 Å - + -
Trichloroethylene - + - -
Xylene (Isomer compound) 4 Å - + -

Acids and Bases for Analysis (p.a.)

Carl ROTH provides suitable acids and bases for different requirements!

  • High purity
  • High batch consistency
  • Detailed specifications
  • Good price-performance ratio


Analysecertificaten

Hier kunt u uw analysecertificaat voor het geselecteerde product zoeken en downloaden. Geef een chargenummer op.
De volgende analysecertificaten werden gevonden:

Guarantee analysis

Assay (acidim.)≥98 %
Carbonate (as Na2CO3)≤1 %
Total nitrogen (as N)≤0,001 %
Chloride (Cl)≤0,005 %
Sulphate (SO4)≤0,005 %
Phosphate (PO4)≤0,001 %
Silicate (SiO2)≤0,01 %
Heavy metals (as Pb)≤0,0005 %
Aluminium (Al)≤0,002 %
Calcium (Ca)≤0,002 %
Iron (Fe)≤0,001 %
Magnesium (Mg)≤0,0005 %
Potassium (K)≤0,05 %
Nickel (Ni)≤0,001 %
Lead (Pb)≤0,001 %
Arsenic (As)≤0,0001 %
Zinc (Zn)≤0,001 %