Call us: +30 2106779800

Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

2106779800
  • English
  • Greek
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%
Select category
  • Select category
  • Arduino Kits
  • Best Sellers
  • Educational Kits
    • Educational Micro-Scale Kits
      • Consumables (Microscale)
      • Microscale Set
    • Educational Set
      • Biology (SET)
      • Chemistry (SET)
      • CSI
      • Environment
    • Packages of Compulsory Secondary Exercises
      • Biology (kit)
      • Chemistry (kit)
      • Environment (kit)
      • Physics (kit)
    • Physics with experiments – Gymnasium
      • Gymnasium Packages
    • Preschool Science
    • Science for Primary School
      • Packages for 4 teams
      • Student – Order Packages
      • Teacher Packages
    • Science School
    • STEM EDUCATION
      • STEAM Primary School
      • STEM Preschool Education
      • STEM Primary Education
      • STEM Secondary Education
  • Educational Products
    • Arts & Sports
      • Artistic
      • Music
        • Music Learning
      • Sports – Gymnastics
    • Biology
      • Anatomy Models
      • Anatomy Tables
      • Botany – Zoology
      • Consumables of Biology
      • DNA Models
      • Embossed Models – STEM
      • Health Education (Biology)
      • Human Foam Systems
      • Instruments – Devices (Biology)
      • Microscope – Preparations (Biology)
        • Collections of Preparations
        • Individual Preparations
      • Microscopes – Stereoscopes
        • Accessories and Supplies
        • Microscope Cameras
        • Microscopes Binoculars
        • Microscopes Monoculars
        • Stereoscopes
    • Chemistry
      • Chemical Reagents
        • Acids
        • Bases
        • Elements
        • Indicators
        • Organic Compounds
          • Alcohols
        • Oxides
        • Salts
      • Consumables (Chemistry)
      • General Equipment (Laboratory)
      • Glassware
      • Instruments – Devices (Chemistry)
      • Laboratory Scales
      • Microscale Chemistry
      • Nanotechnology
      • Plastics
      • Porcelain – Cheramics
    • Earth Sciences
      • Astronomy (Earth Sciences)
      • Geography (Earth Sciences)
      • Geology (Earth Sciences)
      • Meteorology (Earth Sciences)
    • Environment – Ecology
      • Collection Devices
      • consumables (Environment)
      • Green Chemistry
      • Imaging Models
      • Measuring & Test Sticks
      • Microscope – Preparations (Environment)
      • Observers
      • Quality Analysis Packages
      • Renewable Energy
    • Mathematics
      • Fractions, Decimal, Percentages
      • Geometry
      • Math Games
      • Mathematics Tables
      • Measurements
      • Numbering
      • Operations
      • Premathematical Concepts (Mathematics)
      • Time – Money(Mathematics)
    • Physics
      • Educational Toys for Physics
      • Electricity
      • Electromagnetism
      • Fluid Mechanics – Pressure
      • Heat
      • Magnetism
      • Measurements
      • Mechanics
      • Nanotechnology
      • Optical
      • Static Electricity
      • Waves – Oscillations
    • Preschool
      • Card Games
      • Kindergarten Equipment
        • Classroom Boards
        • Indoor Equipment
        • Outdoors Equipment
      • Language
        • English
        • Hellenic
      • Mathematics (Preschool)
        • Measurement – Classification
        • Numbering (Preschool)
        • Paterns – Rows
        • Possibilities
        • Shapes
      • Motor Skills
        • Fine Motor Skills
        • Gross Motor Skills
      • Music Learning
      • Nursery Robotics
        • Lower Primary
          • Kids First Coding
        • Nursery
          • BeeBot BlueBot ProBot
          • Botley
          • Coding Express
          • EaRL
          • Kids First Coding
        • UARO
        • Upper Primary
      • Outdoor Games
      • Role Playing Games
      • Science
        • Animals – Plants (Preschool)
        • Biology – Health Education
        • Ecology – Astronomy (Preschool)
        • Electricity – Magnetism (Preschool)
        • Exploration (Preschool)
        • Forces – Movement (Preschool)
        • Heat (Preschool)
        • Light – Colors – Sound (Preschool)
        • Time – Measurements (Preschool)
      • Sensory
      • Τoys for Creative Activity
    • School Equipment
      • Design Tools
      • Interactive Boards
      • Marker Markers
      • Projective Systems
      • Saving Boxes
      • School Furniture
      • School Maps
      • School Supplies
    • Special Education
    • Stationary – Handcrafts – Drawing Equipment
      • Drawing Equipment
        • Coloured Pencils
        • Crayons
        • Finger Paints
        • Paint Brushes
        • Paint Markers
        • Painting Blocks
        • Painting Related Products
        • Temperas
        • Watercoloured Paints
      • Handicrafts
        • Beads – Sequins
        • Feathers – Eyes – Pom Pom
        • Felt
        • Glues
        • Gold Dust
        • Masks
        • Model Materials
        • Modeling Clay
        • Modeling Wires
        • Papers – Cardboard – Fabrics
        • Polystyrene
        • Tools
        • Various Handicrafts Materials
      • Kindergarten Supplies
    • Technology
      • Cars – Diesel Iocomotives
      • Consumables Technology
        • Accessories (Consumables)
        • Electricity (Consumables)
        • Gears Pulleys (Consumables)
        • Glues (Consumables)
        • Metallic (Consumables)
        • Plastics (Consumables)
        • Sparkling (Consumables)
        • Stationery (Consumables)
        • Various Construction Materials
        • Wooden (Consumables)
      • Electronics
      • Pre-Cut Constructions
      • Renewable Energy
      • Science Kits (Technology)
      • Smart Materials
      • TechCard Technology Packages
        • Classroom Kit (TechCard)
        • Consumables TechCard
        • TechCard Constructions
        • Thematically Kit (TechCard)
      • Tools (Technology)
      • Wooden Constructions
  • Educational Robotics
    • BeeBot
    • Botley
    • Code your Bot!
    • Gigo
    • Spike
  • Elecfreaks Sensors
  • Gift Cards
  • Grove Actuators
  • Innovative Products
  • Laboratory Equipment
    • Chemical Reagents
      • Acids
      • Bases
      • Elements
      • Indicators
      • Organic Compounds
      • Oxides
      • Salts
    • Fixed Laboratory Equipment
      • Consumables (Laboratory)
      • General Equipment (Laboratory)
      • Glassware
      • Plastics
      • Porcelain – Ceramics
    • Fume Hood
    • Laboratory Cabinets
    • Laboratory Devices
      • Centrifuges
      • Electrolysis Devices
      • Electrophoresis
      • Laboratory Scales
      • Laboratory Thermometers
      • Mixers – Heaters
      • Oxygen meters – Air Analysis
      • PHmeters – Conductivity Meters
      • Pippetes Laboratory
      • Polarimeters – Photometers
      • Portable Autoclaves Sterilizers
      • Power Supplies – Measuring Devices
      • Refractometers
      • Spectrophotometers – Spectrum Pipes
      • Timer Laboratory
      • Vacuum Pumps
      • Water Baths – Incubators – Ovens
    • Medical Equipment
    • Microscopes – Stereoscopes
      • Consumables (Laboratory)
      • Microscope – Preparations
      • Microscope Accessories
      • Microscope Cameras
      • Microscopes Binoculars
      • Microscopes Monoculars
      • Stereoscopes
    • Refrigerator Freezer
    • USB Sensors & MBL Sensors
  • Lego Education
  • LEGO Education
    • LEGO Education BricQ Motion
    • LEGO Education Mindstorms
    • LEGO Education Preschool
    • LEGO Education Primary
    • LEGO Education STEM
    • Lego Education WeDo 2.0
  • Offers
  • Open Hardware
    • 3D Printing
    • Arduino
      • Arduino Bots and Devices
      • Arduino Main Boards
    • DFRobot
    • Drones
    • Elecfreaks
      • Elecfreaks Kits
    • Grove System
      • Grove Displays Keyboards Buttons
      • Grove Sensors
    • Keyestudio
    • MicroBit
      • MIcrobit Accessories
      • MicroBit Shields
    • Motors and Actuators
    • Raspberry Pi
    • Sales
      • Arduino Offers
      • Electronic Components
      • Electronic Modules
      • HiTechnic
      • LEGO NXT
      • Mechanical Components
    • Sensors
    • WaveShare
  • Stem Toys
  • Uncategorized
Login / Register
Sign inCreate an Account

Lost your password?
Wishlist
Menu
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%
0 items / €0,00
  • Products
    • Educational Products
      • Special Education
      • Stationary – Handcrafts – Drawing Equipment
      • Physics
      • Chemistry
      • Biology
      • Mathematics
      • Environment – Ecology
      • Earth Sciences
      • Technology
      • Preschool
      • School Equipment
      • Arts & Sports
    • Laboratory Equipment
      • Laboratory Devices
      • Fixed Laboratory Equipment
      • Chemical Reagents
      • Medical Equipment
      • Microscopes – Stereoscopes
    • Educational Kits
      • Science School
      • STEM EDUCATION
      • Preschool Science
      • Science for Primary School
      • Packages of Compulsory Secondary Exercises
      • Physics with experiments – Gymnasium
      • Educational Set
      • Educational Micro-Scale Kits
    • Educational Robotics
      • BeeBot
      • Code your Bot!
      • Gigo
      • Botley
      • Spike
    • Open Hardware
      • MicroBit
      • Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%Keyestudio
      • DFRobot
      • WaveShare
      • Arduino
      • Raspberry Pi
      • Drones
      • Elecfreaks
      • Grove System
      • Sales
      • Sensors
      • Motors and Actuators
      • 3D Printing
  • Stem Toys
  • Proposals
  • B2B
  • News
  • Competitions
    • Competitions of educational robotics
0 items / €0,00
  • English
  • Ελληνικα (Greek)

Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%
Click to enlarge
Home Κατάστημα Laboratory Equipment Chemical Reagents Salts Ammonium DiChromate 500g 99%
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%
Aluminium 500g dust 99% 100-200 mesh €36,29 €45,00 με ΦΠΑ
Back to products
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%
Aniline 99.5% 500mL €8,06 €9,99 με ΦΠΑ

Ammonium DiChromate 500g 99%

€40,32 €50,00 με ΦΠΑ

Ammonium DiChromate 500g 99%
Ammonium dichromate, Ammonium bichromate, Ammonium pyrochromate, vesuvian fire
(NH4)2Cr2O7
M.W: 252.07 g/mol
Cas Number: 7789-09-5
https://pubchem.ncbi.nlm.nih.gov/compound/Ammonium-dichromate

Add to wishlist
SKU: 330128 Categories: Chemical Reagents, Chemical Reagents, Salts, Salts Tag: Chromates
Share:
  • Description
Description

Ammonium DiChromate 500g 99%

Ammonium dichromate is an inorganic compound with the formula (NH4)2Cr2O7. In this compound, as in all chromates and dichromates, chromium is in a +6 oxidation state, commonly known as hexavalent chromium. It is a salt consisting of ammonium ions and dichromate ions.

Ammonium dichromate is sometimes known as Vesuvian Fire, because of its use in demonstrations of tabletop “volcanoes”. However, this demonstration has become unpopular in schools due to the compound’s carcinogenic nature. It has also been used in pyrotechnics and in the early days of photography.

Properties

At room temperature and pressure, the compound exists as orange, acidic crystals soluble in water and alcohol. It is formed by the action of chromic acid on ammonium hydroxide with subsequent crystallisation.

The (NH4)2Cr2O7 crystal (C2/c, z=4) contains a single type of ammonium ion, at sites of symmetry C1(2,3). Each NH4+ centre is surrounded irregularly by eight oxygen atoms at N—O distances ranging from ca. 2.83 to ca. 3.17 Å, typical of hydrogen bonds.

Uses

It has been used in pyrotechnics and in the early days of photography as well as in lithography, as a source of pure nitrogen in the laboratory, and as a catalyst. It is also used as a mordant for dyeing pigments, in manufacturing of alizarin, chrome alum, leather tanning and oil purification.

Photosensitive films containing PVA, ammonium dichromate, and a phosphor are spin-coated as aqueous slurries in the production of the phosphor raster of television screens and other devices. The ammonium dichromate acts as the photoactive site.

Oxidation reactions

Ammonium dichromate is a strong oxidising agent and reacts, often violently, with any reducing agent. The stronger the reducing agent, the more violent the reaction. It has also been used to promote the oxidation of alcohols and thiols. Ammonium dichromate, in the presence of Mg(HSO4)2 and wet SiO2 can act as a very efficient reagent for the oxidative coupling of thiols under solvent free conditions. The reactions produces reasonably good yields under relatively mild conditions. The compound is also used in the oxidation of aliphatic alcohols to their corresponding aldehydes and ketones in ZrCl4/wet SiO2 in solvent free conditions, again with relatively high yields.

Safety

Ammonium dichromate, like all chromium (VI) compounds, is highly toxic and a proven carcinogen. It is also a strong irritant.

Incidents

In sealed containers, ammonium dichromate is likely to explode if heated. In 1986, two workers were killed and 14 others injured at Diamond Shamrock Chemicals in Ashtabula, Ohio, when 2,000 lbs of ammonium dichromate exploded as it was being dried in a heater.

Reactions

Tabletop volcanoes and thermal decomposition
1:10

A few drops of ethanol are added to a small pile of ammonium dichromate ((NH4)2Cr2O7) and ignited. Sparks are emitted and an ash-like product is formed. The phenomenon resembles the eruption of a volcano. The reaction starts at 180 °С, becoming self-sustaining at approximately 225 °С.

Ammonium dichromate decomposition

The volcano demonstration involves igniting a pile of the salt, which initiates the following exothermic conversion:-(NH4)2Cr2O7 (s) → Cr2O3 (s) + N2 (g) + 4 H2O (g) (ΔH = −429.1 ± 3 kcal/mol)

Like ammonium nitrate, it is thermodynamically unstable.[9][10] Its decomposition reaction proceeds to completion once initiated, producing voluminous dark green powdered chromium(III) oxide. Not all of the ammonium dichromate decomposes in this reaction. When the green powder is brought into water a yellow/orange solution is obtained from left over ammonium dichromate.

Observations obtained using relatively high magnification microscopy during a kinetic study of the thermal decomposition of ammonium dichromate provided evidence that salt breakdown proceeds with the intervention of an intermediate liquid phase rather than a solid phase. The characteristic darkening of (NH4)2Cr2O7 crystals as a consequence of the onset of decomposition can be ascribed to the dissociative loss of ammonia accompanied by progressive anion condensation to Cr3O2−10, Cr4O2−13, etc., ultimately yielding CrO3. The CrO3 has been identified as a possible molten intermediate participating in (NH4)2Cr2O7 decomposition.

 

Related products

Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Sodium Iodide, anhydrous (100gr)

€40,32 €50,00 με ΦΠΑ 330194
Sodium Iodide, anhydrous (100gr) nNaI MW: 149.894 CAS: 7681-82-5 https://pubchem.ncbi.nlm.nih.gov/compound/5238    
Add to wishlist
Add to cart
Quick view
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Iodine (500ml) 0,05mol/lt (0,1N)

€32,26 €40,00 με ΦΠΑ 330705
Iodine (500ml) 0,05mol/lt (0,1N)
Add to wishlist
Add to cart
Quick view
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Methylene Blue (100ml)

€11,20 €13,89 με ΦΠΑ 330765
Methylene Blue (100ml) alkaline Loeffler’s staining solution
Add to wishlist
Add to cart
Quick view
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

m-Cresol Purple (5gr)

€16,98 €21,06 με ΦΠΑ 330781
m-Cresol Purple (5gr)
Add to wishlist
Add to cart
Quick view
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Eriochrome Black T (25gr)

€12,10 €15,00 με ΦΠΑ 330810
Eriochrome Black T (25gr) Sodium 1-[1-Hydroxynaphthylazo]-6-nitro-2-naphthol-4-sulfonate, Sodium 4-[2-(1-hydroxynaphthalen-2-yl)hydrazin-1-ylidene]-7-nitro-3-oxo-3,4-dihydronaphthalene-1-sulfonate, Sodium 4-[2-(1-hydroxynaphthalen-2-yl)hydrazin-1-ylidene]-7-nitro-3-oxonaphthalene-1-sulfonate; Solochrome Black T; ET-00; Erio T C20H12N3O7SNa 461.381 g/mol Cas Number: 1787-61-7 https://en.wikipedia.org/wiki/Eriochrome_Black_T
Add to wishlist
Add to cart
Quick view
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Sodium Sulfite, anhydrous (250gr)

€7,66 €9,50 με ΦΠΑ 330185
Sodium Sulfite, anhydrous (250gr) Sodium Sulfite (sodium sulphite) is the inorganic compound with the chemical formula Na2SO3. A white, water-soluble solid, it is used commercially
Add to wishlist
Add to cart
Quick view
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Sodium Thiosulfate, anhy. 500gr

€12,90 €16,00 με ΦΠΑ 330171
Sodium Thiosulfate, anhy. 500gr nNa2S2O3
Add to wishlist
Add to cart
Quick view
Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%

Phenolpthalaine 100ml 0.5%

€6,60 €8,18 με ΦΠΑ 330790
Φαινολοφθαλεΐνη 100ml nΔιάλυμα 0.5 wt. % σε αιθανόλη : νερό (1:1) nC20H14O4 nM.W. : 318.328 g/mol
Add to wishlist
Add to cart
Quick view
Our company
  • Profile
  • Activities
  • Shop
  • Workshops
  • Contact
Information
  • My Account
  • Transaction Security
  • Terms & Conditions
  • Payment, Delivery & Mission
  • Personal Data Protection
CONTACT
+30 210 6779800 info@why.gr Mesogeiwn 446, 153 42 Agia Paraskeuh
Newsletter
Subscribe
Copyright © 2020 why.gr - Διερευνητική Μάθηση All Rights Reserved.
payments
  • Products
    • Educational Products
      • Special Education
      • Stationary – Handcrafts – Drawing Equipment
      • Physics
      • Chemistry
      • Biology
      • Mathematics
      • Environment – Ecology
      • Earth Sciences
      • Technology
      • Preschool
      • School Equipment
      • Arts & Sports
    • Laboratory Equipment
      • Laboratory Devices
      • Fixed Laboratory Equipment
      • Chemical Reagents
      • Medical Equipment
      • Microscopes – Stereoscopes
    • Educational Kits
      • Science School
      • STEM EDUCATION
      • Preschool Science
      • Science for Primary School
      • Packages of Compulsory Secondary Exercises
      • Physics with experiments – Gymnasium
      • Educational Set
      • Educational Micro-Scale Kits
    • Educational Robotics
      • BeeBot
      • Code your Bot!
      • Gigo
      • Botley
      • Spike
    • Open Hardware
      • MicroBit
      • Ammonium DiChromate 500g 99% Ammonium DiChromate 500g 99%Keyestudio
      • DFRobot
      • WaveShare
      • Arduino
      • Raspberry Pi
      • Drones
      • Elecfreaks
      • Grove System
      • Sales
      • Sensors
      • Motors and Actuators
      • 3D Printing
  • Stem Toys
  • Proposals
  • B2B
  • News
  • Competitions
    • Competitions of educational robotics
  • Wishlist
  • Login / Register
Shopping cart
close
We use cookies to improve your experience on our website. By browsing this website, you agree to our use of cookies.
Accept