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Chemical test :, Dip a nichrome wire in acid solution ( hydrochloric…
Chemical test :
Testing for Hydrogen, Oxygen, Carbon Dioxide, Ammonia and Chlorine.
hydrogen = squeaky pop test. Light a splint and place it on top of the test tube containing the gas you want to test. If a squeaky pop sound is heard. Hydrogen is present.
Oxygen = Lighted splint test. Light a splint and blow it out. Put it into the test tube of the gas you want to test. If oxygen is present, the splint will relight.
Carbon dioxide = lime water test. Bubble the gas through lime water using a tube . If carbon dioxide is present the limewater will become milky white and a white precipitate will form.
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what is the purpose ?
To certify that there are no leaks or accumulations of Flammable Vapours or Explosive gases at the worksite when hot work is being under taken.
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using sodium hydroxide
using a test tube containing each cation, add sodium hydroxide and gently warm it. test the gas produced using red litmus paper or by seeing the change in colour / solid
results
Ammonium NH4+ = turns red litmus paper blue
Fe2+ = sludges green precipitate
Fe3+ = brown precipitate
Cu2+ = blue precipitate
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place you cation which include chlorine, bromine and iodine into a test tube. Add acidified silver nitrate ( add nitric acid into the silver nitrate ) and record the colour of the precipitate being formed. ( silver halide)
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Sulfate anions test
first, acidify solution by adding drops of hydrochloric acid, then barium chloride. After, add 5 drops of sodium sulphate to the barium chloride solution you have just created
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Dip a nichrome wire in acid solution ( hydrochloric acid) and place it into a blue bunsen burner flame. We do this to make sure that the nichrome wire is clean and not contaminated. Then, dip the wire in medal substance ( cation) , placing it onto the hottest part of the bunsen burner . repeat using other cations and record color observation
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