chemical anylasis (4.6) Flashcards
what is the test for hydrogen
squeaky pop test
how you carry out the squeaky pop test
1 collect a sample of gas
2 attempt to ignite the gas using a lit splint
3if hydrogen is present u will hear a squeaky pop sound
what is the test for oxygen
glowing splint test
how do u carry out the glowing splint test
1 collect a sample of gas in a test tube
2 place a glowing splint into the tube
3 if oxygen is present the splint will relight
what is the test for the presence of H2O
the copper sulphate test
how do u carry out the copper sulphate test
1 add anhydrous copper sulphate
2 if water is present the solution will change from white to blue
what is the test for purity of H2O
1 measure its boiling point
2 the closer to 100 degrees, the more pure the water is
what is the test for carbon dioxide
the limewater test
how do u carry out the limewater test
1 bubble a sample of gas through limewater
2 if the limewater turns cloudy, carbon dioxide is present
what is the test for chlorine
the damp blue litmus test
how do u carry out the damp blue litmus test
1 place damp blue litmus paper in a sample of gas
2 the blue litmus will turn white if chlorine is present
what is the test for ammonia
damp red litmus test
how do u carry out the damp red litmus test
1 place damp red litmus into a sample of gas
2 if ammonia is present, the paper will turn blue
how do u carry out a flame test
1 dip a piece of nichrome/platinum wire into hydrochloric acid
2dip the wire into a sample of solution or solid
3 place the tip of the wire into a non-luminous bunsen flame
4 have a look at the colour
what does a red flame indicate
Li+
