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How To Set Up Microscale Version – GCSE Chemistry Required Practical – Making Salts

How To Set Up Microscale Version – GCSE Chemistry Required Practical – Making Salts

In this short video, Denise Ralph sets up and demonstrates a microscale version of the AQA GCSE Chemistry Required Practical – Making Salts – making copper sulphate crystals.

Preparation of a pure, dry sample of a soluble salt from an insoluble oxide or carbonate using a kettle to heat dilute acid and a bunsen burner to evaporate the solution.

This practical demonstrates first-hand how salts are formed through the reaction between an acid and a base, and the techniques involved in separating and purifying the salt product.

Microscale chemistry is gaining popularity due to reduced chemical waste, enhanced safety, lower costs, simplified logistics, and a more environmentally friendly approach to experimentation.

 

 

You will need:

  • Kettle
  • 250 ml Beaker x 1
  • Boiling tube x 1
  • 100ml Conical flask x 1
  • Funnel x 1
  • Filter paper x 1
  • 25ml Measuring cylinder x 1
  • Spatula x 1
  • Half wooden splint x 1
  • 1.4M Sulphuric Acid
  • 1.8g Copper (ii) oxide powder
  • Petri dish x 1
  • Weigh boat x 1
  • Bunsen burner
  • Tripod
  • Gauze
  • Heat proof mat

 

Method:

  1. Boil the kettle, half fill beaker with boiled water.
  2. In the boiling tube measure 15ml of Sulphuric Acid, stand boiling tube with acid into the beaker.
  3. Weigh 1.8g of Copper (ii) oxide in the weigh boat.
  4. Add the copper oxide to the sulphuric acid, agitate gently place boiling tube back into the beaker of water. (it will turn blue)
  5. Put filter paper into the funnel and place (rest) in the conical flask.
  6. Filter the solution through the filter paper/funnel – when the blue liquid has filtered through the left over copper (ii) oxide will be left in the filter paper.
  7. Light the Bunsen and place the conical flask on top of the gauze and heat until just boiling (do not let it dry out).
  8. Carefully take the conical flask off of the gauze and pour the hot solution into the petri dish place the half wooden splint in the petri dish (this will help the crystals form).

Top Tech Tip: Using less acid,  the teacher can boil the kettle and add to beakers so that the students do not have to boil or touch the hot water, and you can also get results from not having to use a Bunsen’s to reheat the copper sulphate solution in the conical flask.

All health and safety measures are the responsibility of the teacher doing the demonstration. A thorough risk assessment should be carried out and guidance procedures followed. It is suggested that you practice before demonstration in front of a class.

 

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