unit 9: t25- tests for ions Flashcards
1
Q
why must ion tests be unique?
A
the results of a test must let you determine which ion is present
2
Q
if lithium, Li+, is present what colour will the flame be?
A
red
3
Q
if sodium, Na+, is present what colour will the flame be?
A
yellow
4
Q
if potassium, K+, is present what colour will the flame be?
A
lilac
5
Q
if calcium, Ca2+, is present what colour will the flame be?
A
orange-red
6
Q
if barium, Ba2+, is present what colour will the flame be?
A
green
7
Q
if copper, Cu2+, is present what colour will the flame be?
A
blue-green
8
Q
describe the flame test
A
- dip a clean wire loop into a solid sample of the compound being tested
- put the loop into the edge of the blue flame in the busen burner
- observe and record the flame test pdoduced
9
Q
test for carbon dioxide
A
- bubble carbon dioxide gas through a solution of limewater
- turns limewater cloudy
10
Q
tests for carbonates
A
- add dilute hydrochloric acid to sample
- take gas produced and bubble it through limewater
- limewater goes cloudy goes cloudy if carbonates are present
11
Q
how does tests for carbonates work?
A
if limewater goes cloudy its positive and carbonates were present
12
Q
tests for sulfate
A
-add dilute HCl to remove any carbonate and sulfite ions
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