• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Contaminated Water

Extracts from this document...


Unit 1: Risk Assessment Chemical or Equipment Hydrochloric Acid Barium Nitrate Sodium Hydroxide Silver Nitrate Test tube Flame Test Wire Bunsen Burner Contaminated Water Hazard Corrosive Harmful Corrosive Corrosive Sharp Sharp/Contain traces of chemicals Heat hazard Corrosive, harmful, irritant Nature of Risk Could burn Poison Could burn Could burn Could cut skin Could bur, cut or poison Could burn Poison, skin damage Minimise Risk Wear safety goggles and glove Do not drink and wash hands Wear gloves and safety goggles Wear gloves and safety goggles Handle with care Handle with care Wash hands Hold wooden handle Handle with care Do not ingest and wear safety goggles and gloves Emergency Procedure Wash hands Drink water and Wash hands Wash hands Wash hands Seek first aid Seek first aid Seek first aid Seek first aid Disposal Pour down sink Pour down sink Pour down sink Pour down sink Put in sharps bin Put in sharps bin No disposal Pour down sink Apparatus Apparatus Reason Hydrochloric Acid ...read more.


Method B The contaminated water has been boiled down but the residues still remain. To test the contaminant residues you must: Prepare a Bunsen burner on a medium flame. Then heat a flame test wire, which cleans it. Then dip the wire into hydrochloric acid to clean it. Repeat these processes until the wire is completely clean. Dampen the end of the flame test wire with some water. Then dip it into the contaminant residues that remain from the boiled water. Place and hold the flame test wire into the flame. Observe and record what colour the flame is that the powder burns. Results Part A Chemical Used Colour it turned Barium Chloride No colour change Hydrochloric Acid No colour change Silver Nitrate Cloudy Sodium Hydroxide No colour change No repeat were required to produce this results as I knew there was only one contaminant and only one chemical used observed any colour change at all. ...read more.


Evaluation This experiment used a very simple method, that allowed me to be able to fully understand the experiment and prevent any mistakes. Also, method A was basic repetition so I knew what results to expect. This experiment was very easy to carry out. This was due to the fact that the experiment required no measuring of the liquids, as the results do not differ, and no timings were required as we were not testing rate of reaction. Problems still however arose from this experiment. Colour change was observed by the human eye, so minute colour changes may be hard to see. Also, people may not see the same colour as was seen by others. If I were to do this experiment again, I would try to increase the reliability of the results gathered. For my flame test, I would use cobalt-blue glass to accurately observe the colour of the flame. For my chemical reactions test, I would use a colourimeter to observe the colour change, as it would document all change and would be more precise and reliable than the human eye. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work