analysis Flashcards
(14 cards)
describe the gas test for oxygen and the positive result. explain why this works
insert a glowing splint into the gas. if the glowing splint relights, oxygen is present. oxygen is an oxidizing agent
describe the gas test for hydrogen and the positive result. explain why this works
insert a lit splint into the gas. if you hear a squeaky pop hydrogen is present. hydrogen is explosive
describe the gas test for carbon dioxide and the positive result. explain why this works
bubble the gas through limewater. if carbon dioxide is present, the limewater turns milky. because a precipitate on calcium carbonate is formed
describe the gas test for chlorine and the results if chlorine is present. explain why this works
insert a damp piece of blue litmus paper into the gas. if chlorine is present the paper goes red then bleach because chlorine is a bleaching agent
describe the gas test for ammonia and the positive result. explain why this works
insert a damp piece of red litmus paper into the gas. the paper will turn blue if ammonia is present because ammonia is a base
in the flame test what color does lithium turn the flame
red
in the flame test what color does sodium turn the flame
yellow
in the flame test what colour does potassium turn the flame
lilac
in the flame test what colour does calcium turn the flame
orange-red
in the flame test what color does copper turn the flame
blue green
how to carry out a sodium hydroxide test
add 1ml of the sample solution to be tested to a test tube. add sodium hydroxide. observe a precipitate form. record the color
what is formed in a sodium hydroxide test
a precipitate
in a sodium hydroxide test what color will the precipitate be if the sample is copper (II)
blue
in a sodium hydroxide test what color will the precipitate be if the sample is iron(II)
green
