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Sodium hydroxide, 1 kg

≥98 %, p.a., ISO, in pellets
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.
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
Pack Qty.
Pack.
Empirical formula NaOH
Molar mass (M) 40,0 g/mol
Density (D) 2,13 g/cm³
Boiling point (bp) 1390 °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.

Guarantee analysis

€27.85/Pack Qty. 

excl. VAT. | 1 kg per Pack Qty.

Art. No. 6771.1

Available at short notice
Free of shipping costs from 125 €
from 6 Pack Qty. €26.46/Pack Qty.
from 24 Pack Qty. €25.06/Pack Qty.
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Product details



Technical Information
Suitable (as desiccant) for Alkaline fluids (e.g. amines)  
Not suitable (as desiccant) for Acids, acid derivatives, phenols  
Sodium hydroxide
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Order No. Pack Qty. Pack. Price Quantity
6771.1 1 kg plastic €27.85
6771.2 5 kg plastic €100.55
6771.3 500 g plastic €18.20
6771.5 25 kg plastic €385.95
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General information

Analysis of Food

Carl ROTH also offers reagents suitable for food analysis.

On the following pages, you will find the determination of
• Nitrogen according to Kjeldahl
• Sugar
• Mercury
• Trichinae
• Fat

and the determination of the
• Iodine value
• Acid value
• Peroxide value
• Saponification value

as well as other determining factors such as
• Viscosity
• Density
• Hydroxyl value
• Fluoride ions


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.


Acids and Bases for Analysis (p.a.)

Carl ROTH provides suitable acids and bases for different requirements!


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 - + -

Analysis certificates

You can search for and download your certificate of analysis for the selected product here. Please provide your batch number.
The following analysis certificates have been found:

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 %  

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