cation tests

Question 1

is a cation positive

Answer 1

yes

Question 2

examples of cations

Answer 2

Li+, Na+, K+, Ca2+, Cu2+, Fe2+, Fe3+, NH4+

Question 3

how to conduct a flame test

Answer 3

1. dip a piece of nicrome/platinum wire into hydrochloric acid to clean it
2. dip the wire into a sample of solid or solution
3. place the tip of the wire into a NON-LUMINOUS bunsen flame

Question 4

what colour does Li+ turn

Answer 4

red

Question 5

what colour does Na+ turn

Answer 5

yellow

Question 6

what colour does K+ turn

Answer 6

lilac

Question 7

what colour does Ca2+ turn

Answer 7

orange-red

Question 8

what colour does Cu2+ turn

Answer 8

blue-green

Question 9

how to conduct an NaOH test (sodium hydroxide)

Answer 9

1. dissolve the sample into water
2. add a few drops of NaOH(aq)

Question 10

precipitate colour and formula of Cu2+

Answer 10

blue, Cu(OH)2

Question 11

precipitate colour and formula of Fe2+

Answer 11

green, Fe(OH)2

Question 12

precipitate colour and formula of Fe3+

Answer 12

brown, Fe(OH)3