Category: Recipes

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Recipe of the Week – Week 30: Ethanol

Continuing our new series of chemical recipes, we bring you week 30 – Ethanol (C2H6O)

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

Recipe(s):

Wear eye protection. Keep away from sources of ignition.
1 litre 70% ethanol – 700ml ethanol and 300ml water.
1 litre 90% ethanol – 900ml ethanol and 100ml water.
1 litre 95% ethanol – 950ml ethanol and 50ml water.

Download the PDF recipe

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your ethanol.

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Recipe of the Week – Week 29: Biuret Reagent

Continuing our new series of chemical recipes, we bring you week 29 – Biuret Reagent (C2H5N3O2)

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

Recipe(s):

SOLUTION A: Biuret’s Reagent, Qualitative, Sodium Hydroxide Solution
0.4M Sodium Hydroxide (CORROSIVE) – 16g Sodium Hydroxide made up to 1000ml with (distilled/ deionised) water.

SOLUTION B: Biuret’s Reagent, Qualitative, Sodium Hydroxide Solution
0.01M Copper (II) Sulphate (VI) – 2.5g Copper (II) Sulphate (IV) made up to 1000ml with (distilled/ deionised) water.
For the test, mix SOLUTION A with the test solution in a ratio of 1:1. Add SOLUTION B one drop at
a time, shaking well after each addition. A purple or pink colour shows the presence of protein.

Download the PDF recipe

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your biuret reagent.

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Recipe of the Week – Week 28: Biuret Solution

Biuret Solution

Continuing our new series of chemical recipes, we bring you week 28 – Biuret Solution (C2H5N3O2)

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

Recipe:

  1. Dissolve 1.5g copper(II) sulphate-5-water and 6g potassium sodium tartrate in 500ml water.
  2. Stir in 375ml of 1M sodium hydroxide solution (CORROSIVE), stirring continuously.
  3. If a precipitate appears, add 1g potassium iodide, then dilute to 1000ml with water.
  4. Bottle and label as necessary. The solution is a deep blue colour.

Download the PDF recipe

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your biuret solution.

 

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Recipe of the Week – Week 27: Manometer Fluid

Continuing our new series of chemical recipes, we bring you week 27 – Manometer fluid

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

What is Manometer Fluid?

A manometer measures the pressure acting on a column of fluid. It is made from a U-shaped tube of liquid in which the difference in pressure acting on the two straight sections of the tube causes the liquid to reach different heights in the two arms.*

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your manometer fluid.

*Source: https://www.bbc.co.uk/bitesize/guides/zrcmn39/revision/3

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Recipe of the Week – Week 26: Iodine Solutions

Continuing our new series of chemical recipes, we bring you week 26 – Iodine Solution (I₂)

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

What is an Iodine Solution?

Iodine solutions are used to show sublimation and is a constituent of many biological stains.

0.01M (For Starch test) – 0.1M can be used for most activities.

Remember to use in a well-ventilated area and store in a glass-stoppered bottle.

Stirring Iodine solutions will take time!

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your iodine solution.

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Recipe of the Week – Week 25: Sudan III

Continuing our new series of chemical recipes, we bring you week 25 – Sudan III (C22H16N4O)

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

What is Sudan III?

Sudan III is a bis(azo) compound that is 2-naphthol substituted at position 1 by a 4-{[(2-methylphenyl)diazenyl]phenyl}diazenyl group. A fat-soluble dye predominantly used for demonstrating triglycerides in frozen sections, but which may also stain some protein bound lipids in paraffin sections. It has a role as a fluorochrome, a histological dye and a carcinogenic agent. It is a member of azobenzenes, a bis(azo) compound and a member of naphthols. It is functionally related to a 2-naphthol.*

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your Sudan III

 

*https://pubchem.ncbi.nlm.nih.gov/compound/Sudan-III
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Recipe of the Week – Week 24: Sodium Thiosulphate

Continuing our new series of chemical recipes, we bring you week 24 – sodium thiosulphate (Na2S2O3)

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

What is sodium thiosulphate?

Sodium thiosulphate is an inorganic sodium salt composed of sodium and thiosulfate ions in a 2:1 ratio. It has a role as an antidote to cyanide poisoning, a nephroprotective agent and an antifungal drug. It contains a thiosulfate(2-).*

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your sodium thiosulphate.

 

*https://pubchem.ncbi.nlm.nih.gov/compound/Sodium-thiosulfate
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Recipe of the Week – Week 21: Bromine

Continuing our new series of chemical recipes, we bring you week 21 – bromine  (Br2).

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

What is bromine?

Bromine is a deep-red, oily liquid with a sharp smell. It is toxic and is used in many areas such as agricultural chemicals, dyestuffs, insecticides, pharmaceuticals and chemical intermediates. Some uses are being phased out for environmental reasons, but new uses continue to be found.

Bromine compounds can be used as flame retardants. They are added to furniture foam, plastic casings for electronics and textiles to make them less flammable. However, the use of bromine as a flame retardant has been phased out in the USA because of toxicity concerns.
Organobromides are used in halon fire extinguishers that are used to fight fires in places like museums, aeroplanes and tanks. Silver bromide is a chemical used in film photography.
Before leaded fuels were phased out, bromine was used to prepare 1,2-di-bromoethane, which was an anti-knock agent.

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your safe and prepared bromine.

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Recipe of the Week – Week 20: Ferroxyl Indicator

Continuing our new series of chemical recipes, we bring you week 20 – ferroxyl indicator (K3Fe(CN)6 (aq)).

Remember that when preparing any of our recipes, you should:

  • Always wear appropriate PPE including eye protection and gloves.
  • Always add acid to water (never water to acid).
  • Use a fume cupboard.
  • Always carry out a risk assessment when using any chemicals.
  • Follow all recommended safety procedures and adhere to the label instructions, hazard warnings and local legislations.

What is ferroxyl indicator?

Ferroxyl indicator can be used to show the process of rusting. When iron atoms begin to rust, they lose electrons to form iron ions. Ferroxyl indicator turns blue in the presence of iron ions. This shows that rusting has begun, even if there is no reddish brown rust showing on the surface of the iron. A pink colour is also produced by the ferroxyl indicator. This shows that the ions being lost by iron are being gained by the water and oxygen that are also involved in rusting

Click here to view the PDF recipe card to either save to your local files or add it as a bookmark to your browser.

Scan the QR codes for classroom experiments to follow with your safe and prepared ferroxyl indicator.