anion tests

Question 1

are anions positive

Answer 1

no

Question 2

examples of anions

Answer 2

Cl-, Br-, I-, CO3^2-, SO4^2-

Question 3

what are the halides

Answer 3

Cl-, Br-, I-

Question 4

how to test for halides

Answer 4

silver nitrate test

Question 5

how to conduct a silver nitrate test

Answer 5

dissolve sample into water, add nitric acid, add silver nitrate solution

Question 6

precipitate colour and formula of Cl-

Answer 6

white, AgCl

Question 7

precipitate colour and formula of Br-

Answer 7

cream, AgBr

Question 8

precipitate colour and formula of I-

Answer 8

yellow, AgI

Question 9

how to test for carbonates (CO3^2-)

Answer 9

add hydrochloric acid to sample - look for effervescence
if so, bubble gas through limewater

Question 10

how to test for sulphates (SO4^2-)

Answer 10

add hydrochloric acid - look for effervescence
if theres is NONE, add barium chloride solution
if they are present they will form a white precipitate

Question 11

why is checking for effervescence when testing for sulphates important

Answer 11

carbonates also form a white precipitate with barium ions