chemical analysis

Question 1

flame test for lithim (Li+)

Answer 1

flame turns dark red

Question 2

flame test for sodium (Na+)

Answer 2

yellow (remember banana)

Question 3

flame test for pottasium (K+)

Answer 3

liliac

Question 4

flame test for copper (cu2+)

Answer 4

blue- green

Question 5

flame test for calcium (Ca2+)

Answer 5

orange-red

Question 6

test for halides-

Answer 6

-dissolve substance in water
add nitric acid (HNO3)
-use silver nitrate
-forms precipitate (solid)

Question 7

test for chlorine

Answer 7

-add silver nitrate- -Ag+ (aq)+(Cl-) –>(AgCl)
-forms white precipitate

Question 8

test for bromide-Br-

Answer 8

add silver nitrite
forms cream precipitate

Question 10

test for iodide
I-

Answer 10

use silver nitrate
forms yellow precipitate

Question 11

test for a carbonate

Answer 11

use equation- acid +carbonate—> salt +water +carbon dioxide
add hydrochloric acid- look for effervescance
if everffescence bubble gas through limewater
bubbles= carbonate

Question 12

test for sulfate

Answer 12

add hydrochloric acid and look for effervescence
if no effervescence -use barium nitrate or chloride
f-orms white precipitate

Question 13

test for copper- cu2+

Answer 13

forms blue precipitate

Question 13

positive ions-

Answer 13

-flame test
-warm, test gas produced
- sodium hydroxide forms precicipitate

Question 13

test for iron- Fe2+

Answer 13

green precipitate

Question 14

test for iron Fe3+

Answer 14

brown precipitate